2025 PSLE Science Paper: What Every P6 Parent Needs to Know

The 2025 PSLE Science paper has come and gone,  but for many P6 parents, the questions your child came home with still linger. Which topics took up most of the marks? Why did your child lose points on questions they had revised? Understanding exactly what the 2025 PSLE Science paper tested is the first step towards making sure your child is better prepared.

This paper analysis breaks down every section of the 2025 PSLE Science examination, from mark distribution by topic to the three questions that tripped up the most students. It gives parents a clear picture of where marks were won and lost.

In this guide, you will find the full topic and marks breakdown, a look at the P5 and P6 topics that dominated the paper, a deep analysis of the three hardest questions, five answering techniques your child can start using right away, and a recommended revision sequence for the next PSLE.

Table of Contents:

1. How the 2025 PSLE Science Paper Was Structured

2. Table 1 - Breakdown of Concepts Tested

3. Table 2 - Top 10 Topics by Mark Weightage

4. Key Insights from the 2025 Paper

5. Deep Analysis of 3 Commonly Difficult Questions

6. Five PSLE Science Answering Techniques Your Child Must Practise

7. Recommended Revision Sequence for PSLE Science

How the 2025 PSLE Science Paper Was Structured

The 2025 PSLE Science paper was divided into two booklets, and your child had 1 hour and 45 minutes to complete both. Knowing the structure helps parents understand where their child's time and effort should be directed during revision.

• Booklet A: 28 Multiple-Choice Questions (MCQs), each worth 2 marks — total 56 marks.

• Booklet B: 12 Open-Ended / Structured Questions (Q29 to Q40) — total 44 marks.

Combined total: 100 marks.

Booklet A carries more total marks (56) but each question is discrete. Booklet B's open-ended questions demand structured written answers, and a single question can span multiple concepts — making it the section where the most marks are either secured or lost. Understanding the mark distribution across topics is therefore essential before any revision plan is drawn up.

Here is a breakdown of the key topic groups tested across both booklets:

• Experimental Questions — 11 marks (single largest topic group)

• Energy (Conversion, Forms & Uses) — 13 marks combined across P5/P6 topics

• Heat & Temperature — 12 marks

• Matter (Mass, Volume, Properties) — 11 marks

• Reproduction in Humans & Plants — 8 marks

• Electrical Systems — 5 marks

• Forces — 5 marks

• Body Systems — 6 marks

• Plant Reproduction & Photosynthesis — 5 marks

With the structure clear, it becomes easier to see which topics deserve the most revision time — and why P5 and P6 content must come first.

Table 1 - Breakdown of Concepts Tested

The table below maps every question in the 2025 paper to its primary concept/topic and the level (P3-P6) at which the concept is taught. MCQs are worth 2 marks each; OEQ marks follow the paper.

Note: Several questions test more than one concept (e.g., Q32 integrates Photosynthesis, Plant System and Experimental Technique; Q40 integrates Electromagnets, Energy Conversion and Forces). Where a question straddles two concepts, its marks are allocated to the dominant concept.

Table 2 - Top 10 Topics by Mark Weightage

The ten topics with the highest mark weightage in the 2025 paper are summarised below. Together they account for 73 of the 100 marks.

Marks Distribution by Level

The same paper, viewed by level of instruction (some questions overlap two levels and are counted in both, so totals exceed 100):

Key Insights from the 2025 Paper

Why P5 and P6 Topics Carry the Most Marks

One of the clearest findings from the 2025 PSLE Science paper is how heavily the mark distribution favours upper primary content. P5 topics accounted for 33 marks, and P6 topics contributed 31 marks. Together, that is 64 marks — just under two-thirds of the entire paper.

For parents planning their child's revision schedule, this has a direct and practical implication. If time is limited, the priority sequence should follow this order:

• P5 and P6 topics first — these carry the most weight and should receive the bulk of revision time

• P4 topics second — a meaningful contribution that should not be overlooked

• P3 topics last — foundational, but with a smaller share of the marks

This does not mean P3 and P4 content can be ignored. Many P5 and P6 topics build on earlier concepts, so gaps in lower primary understanding will surface in higher-level questions. However, knowing where the marks sit allows your child to allocate revision time wisely rather than spending equal time on every chapter.

A well-structured revision plan, anchored to this mark distribution, is one of the most practical things a P6 child can act on before sitting the PSLE Science exam.

How to Handle Experiment-Based Questions Confidently

Experiment-based questions appeared across multiple sections of the 2025 PSLE Science paper and collectively contributed 11 marks — the single largest topic group in the paper. Questions embedded experimental technique in diverse contexts: a fair test on fruit ripening, a yoghurt experiment, a plant with a carbon dioxide sensor, a mosquito repellent trial, and measuring the volume of a floating object.

What this tells parents is that science experiment skills are not an occasional add-on — they are a core and recurring part of the exam. Your child needs to be confident with each of the following skills:

• Stating the aim of an experiment clearly and completely

• Stating or explaining the relationship between the changed variable and the measured variable

• Explaining how a fair test is ensured — identifying which variables are kept constant and why

• Explaining how reliable results are obtained — typically by repeating the experiment and taking an average

• Distinguishing a hypothesis from a conclusion — and stating each one correctly in the required format

• Identifying a control set-up and explaining its purpose in the experiment

• Describing procedural steps clearly and in a logical sequence

Each of these skills has a specific format that examiners expect. A child who understands the concept but writes an incomplete or vague answer will still lose marks. Practising with past year experiment questions — and checking answers against the mark scheme — is the most reliable way to build this skill.

Why Concept Integration Separates High Scorers From the Rest

Several questions in the 2025 PSLE Science paper required your child to apply two or more concepts together within a single answer. This is where students who rely on single-topic template answers tend to lose one to two marks per question — not because they do not know the content, but because they apply it in isolation.

The questions that required integrated thinking included:

• Q10 — Circulatory System combined with Graph Interpretation

• Q22 — Heat Conductivity combined with real-life reasoning

• Q32 — Photosynthesis, Respiration, and Experiment skills applied together

• Q38 — Energy Conversion, Forces, and Sound in one question

• Q40 — Electromagnet, Energy, and Forces combined

The skill being tested here is not just recall — it is the ability to see how one Science concept connects to another. A child answering Q32, for example, needs to understand that photosynthesis and respiration are not separate topics to be answered separately; the question asks how they interact within a single experimental set-up.

Helping your child revise by topic is useful, but it is equally important to practise questions that blend two topics. Working through these multi-concept questions — ideally with feedback on where the reasoning breaks down — is one of the most effective ways to move from a B to an A in PSLE Science.

Real-Life Application McQs That Catch Students off Guard

The 2025 paper included several MCQs that placed familiar Science concepts inside unfamiliar real-life situations. These are the questions where careless

mistakes happen most frequently, even for well-prepared students.

Three questions are particularly worth noting:

• Q22 — "The Otah question": Food wrapped in leaves placed over a fire. This question tested heat conductivity, but the context — a traditional cooking method — was unfamiliar to many students. Those who panicked at the scenario and tried to recall a matching template answer lost marks. Those who applied a logical, step-by-step approach to identify what was being asked performed far better.

• Q17 — Material for a medicine bottle: A question about material properties applied to a specific, real-world object. Students needed to evaluate which property was most relevant to the use case, not simply recall a list of material properties.

• Q20 — Drying cups: A question requiring students to reason about evaporation in a practical context, using a graph to support their answer.

These higher-order MCQs are designed to test whether your child can think with Science rather than just recall Science. The most effective approach is to teach your child to read the question carefully, identify the concept being tested, and reason from first principles — rather than looking for a matching scenario they have seen before.

Practising with a wide variety of PSLE Science questions — including unfamiliar contexts — is the best preparation for this type of question.

Graph and Diagram Interpretation: The Silent Mark Loser

At least six questions in the 2025 PSLE Science paper required your child to read a graph or interpret a diagram before any Science concept could even be applied. These questions included Q10, Q14, Q20, Q23, Q32, and Q38c.

This matters because graph-reading is not a Science skill — it is a prerequisite skill.

If your child misreads the scale, confuses the axes, or counts intervals incorrectly, every answer that follows will be wrong, regardless of how well they understand the Science concept itself.

Specific examples from the 2025 paper illustrate this well:

• Q10 required accurate reading of Jane's heart-rate graph, including reading intervals correctly, before the Circulatory System concept could be applied

• Q38c required counting sound peaks on a diagram to determine frequency before answering the question

The implication for revision is clear. Graph and diagram practice should not be treated as a minor skill. Your child should regularly practise reading line graphs, bar graphs, and scientific diagrams — checking that they can identify axes, read specific values, and describe trends accurately. These foundational skills unlock marks across multiple questions.

Deep Analysis of 3 Commonly Difficult Questions

The three questions selected below represent three distinct skill demands: (a) a real life application MCQ, (b) a procedural or experimental Open Ended Question, and (c) a multi concept Open Ended Question that requires careful tracking of the conditions stated in the stem.

Question 22 (MCQ, 2 marks): The “Otah” Question on Heat Conduction

Question:

Michael cooks food wrapped in leaves over a fire. After a while, there are burnt marks on the leaves. Which statement best explains why?

1. The food is a poor conductor of heat.

2. The leaves allow heat to pass through.

3. The leaves are poor conductors of heat. (CORRECT)

4. The temperature of the food is too high.

Why students find this hard

The most common confusion is between options (1) and (3). Students reason, “If the food absorbed heat quickly, the leaves would not burn,” which sounds plausible, so they pick (1). They also choose (4) because they associate high temperature with burning.

Suggested logical approach for students

When the situation is unfamiliar, students should not jump straight to a single concept. Instead, they should test each plausible option using a one variable thought experiment. Mentally swap the property in the option for its opposite and ask whether the outcome still makes sense in real life.

Test option (1).Imagine the food were a good conductor of heat instead, such as wrapping a metal fork in the same leaf over the fire. Would the leaf still burn? Yes. Therefore, the property of the food is not what causes the leaves to burn. Option (1) is eliminated.

Test option (3).Imagine the leaves were good conductors of heat instead, such as wrapping the same food in aluminium foil when barbecuing fish or potatoes. Would there be burnt marks on the foil? No. Everyday experience tells us aluminium foil does not burn easily in this situation. Therefore, the property of the leaves is what causes the burning.

Conclude.The leaves are poor conductors of heat, so option (3) is correct.

Full science explanation

The part of the leaf in contact with the fire absorbs heat. Because leaves are poor conductors of heat, the heat is not conducted away quickly to cooler parts of the leaf. Heat builds up at the hot spot until combustion temperature is reached, causing the leaf to burn.

Common mistakes to avoid

• Writing “heat cannot escape” because this is vague. The answer should use phrases such as “poor conductor of heat” or “heat is conducted away slowly”. • Confusing conductor and insulator logic. A poor conductor causes heat to remain concentrated at the hot region, leading to burning.

Question 37 (OEQ, 3 marks): Measuring the Volume of a Floating Object

Question:

Priya has an object S which floats in water. The apparatus provided includes a 20 g mass, string, a measuring cylinder and a beaker. Describe how the volume of S can be measured. [3 marks]

Why students find this hard

Most students know the water displacement method but become confused when the object floats. They either ignore the fact that S floats and write the standard method, or they use the beaker and measuring cylinder incorrectly. The question also includes distracting apparatus details which some students mistake for calculation targets.

Suggested approach

(First identify the topic: Matter and volume of irregular shaped objects)

1. Fill the measuring cylinder partially with water and record the initial water level, V1.

2. Tie the 20 g mass to object S using the string. Lower both into the measuring cylinder so that S is fully submerged. The mass acts as a sinker.

3. Record the new water level, V2.

4. Remove S and place only the 20 g mass into the measuring cylinder. Record the water level, V3.

5. Volume of S = V2 − V3.

Marking points

1 mark for describing the displacement method for an irregular object. • 1 mark for recognising that S floats and therefore requires the 20 g mass as a sinker. • 1 mark for the correct subtraction method: Volume of S = reading with both objects − reading with only the mass.

Common mistakes to avoid

Forgetting to fully submerge the floating object. Always tie it to the sinker. • Subtracting from the initial reading instead of the mass only reading. • Not measuring the volume of the 20 g mass separately. Full marks require isolating the contribution of S. • Using the beaker to measure volume, since beakers are not accurately graduated.

Question 40(c) (OEQ, 2 marks): Electromagnet Drives Object P Deeper

Question:

Using the same box of sand, object P and the fixed iron bar, without changing its height, suggest changes to the set up to drive object P deeper into the sand. [2 marks]

Why students find this hard

Students correctly recall that greater gravitational potential energy leads to greater kinetic energy, which then leads to deeper penetration. Many therefore reflexively answer “drop from a greater height”. However, the condition “without changing its height” rules this out. This is a classic example of students ignoring a condition stated in the question.

Topics tested

Electromagnets, energy conversion and forces.

Step by step reasoning

1. To drive P deeper, the iron block must transfer more kinetic energy upon impact.

2. Greater kinetic energy comes from greater gravitational potential energy at the drop point. Gravitational potential energy depends on mass and height.

3. Height is fixed by the question, so the only way to increase gravitational potential energy is to increase the mass of the iron block.

4. However, the original electromagnet could only just support the iron block. A heavier block would not be held securely. Therefore, the electromagnet must also be strengthened by either:

   • adding more turns of wire around the iron bar, or

   • adding more batteries to the circuit.

Full marks model answer

“Use an iron block with a larger mass and add more turns of wire around the iron bar, or add more batteries to the circuit, so that the strengthened electromagnet can carry the heavier iron block.”

Common mistakes to avoid

Writing “drop from a greater height”, which is explicitly disallowed by the question and earns zero marks. • Writing only “use a heavier iron block”, which gains only 1 mark because the existing electromagnet may not be able to support it. • Writing “push object P harder”, which does not address the relevant Science concepts.

Five PSLE Science Answering Techniques Your Child Must Practise

The 2025 PSLE Science paper exposed five recurring weaknesses in how students approach questions. These techniques target those weaknesses directly, and they apply to every future Science paper your child will sit.

Tip 1 — Use the logical-reasoning approach for unfamiliar MCQs

Questions like Q22 wrap a familiar concept inside an unfamiliar real-life scene. When your child encounters an MCQ set in an unfamiliar context, they should not jump to the first concept that comes to mind. Instead, take each plausible option and mentally swap the property mentioned for its opposite. Test whether the new scenario makes sense in everyday life. If it contradicts real-life experience, eliminate that option.

Tip 2 — Identify the topic(s) tested before writing any answer

Before writing a single word for an open-ended question, your child should label the question with its concept or concepts. Q32c tests Photosynthesis + Microorganisms + Fair Test. Q40c tests Electromagnets + Energy + Forces. Knowing the topic triggers the right template answer and the right number of marking points.

Tip 3 — Underline and cross out condition constraints

Phrases like 'without changing its height', 'using the same apparatus', and 'with the same number of batteries' are condition constraints. Your child should underline them before answering, then cross out any draft answer that violates them. This one habit would have recovered most of the marks lost on Q40c.

Tip 4 — Circle the marks allocation and look for plural keywords

A question worth 2 marks almost always requires two distinct marking points. A question worth 3 marks typically requires the concept, an application, and a justification. Plural keywords such as 'changes' or 'reasons' signal that more than one item is expected. Train your child to circle the mark allocation before reading the question.

Tip 5 — Underline key information in the question stem

Underlining data — 'the electromagnet could just carry', 'the object floats', 'the sun set at 6 pm' — keeps critical facts visible while your child is reasoning through the answer. Missing a single phrase, as happened to many students on Q40c, can invalidate an otherwise correct answer.

Consistent practice with these techniques — applied to every mock paper and practice question — is what separates students who read the concepts from students who apply them reliably under exam conditions.

Recommended Revision Sequence for PSLE Science

With PSLE Science covering topics from Primary 3 through to Primary 6, parents often ask: where should revision start? The 2025 paper provides a clear answer — begin with the topics that carry the most marks, then work downwards.

Follow this sequence:

• Master the top-weightage topics first: Experimental Questions, Energy (Conversion, Forms & Uses), Electricity, Reproduction, Forces, Heat & Temperature.

• Drill experimental technique using the 2025 paper's Q12, Q14, Q32, Q33, and Q37 with full worked answers.

• Complete 10 unfamiliar-context MCQs per week using the logical-reasoning approach from Tip 1.

• For every open-ended question, apply Tips 2 to 5 to every draft before writing the final answer.

• End each week with a timed past paper (2023, 2024, or 2025) under exam conditions — time yourself and mark strictly.

Several questions in the 2025 PSLE Science paper required two concepts to be applied together. Q10 combined the Circulatory System with graph interpretation. Q32 combined Photosynthesis, Respiration, and Experimental Technique. Q38 combined Energy Conversion, Forces, and Sound. Revision that drills single topics in isolation will not fully prepare your child for this level of integration.

The goal is not just to recall facts — it is to build the habit of connecting ideas across topics, reading questions carefully, and applying the right technique consistently. That combination is what earns marks in the PSLE Science examination.

Many parents come to AGrader with the same concern: their child understands the Science content in class but loses marks in the actual paper because they cannot apply what they know under exam conditions. It is not a knowledge gap — it is an answering technique gap. Closing that gap takes structured practice with the right guidance.

AGrader's Primary Science Tuition Programme is available for Primary 3 to Primary 6 students, with physical classes at over 19 locations island-wide and online classes for Primary 5 and Primary 6. The programme is built around the MOE-aligned syllabus and teaches content ahead of the school schedule so your child is never caught off guard by new topics.

Weekly lessons are taught by NIE-trained or full-time specialist teachers who coach not just concepts but exam-answering techniques — exactly the skills this paper analysis shows your child needs. All students receive complimentary access to EverLoop, AGrader's exclusive after-class improvement system with five modules: Past Year Paper Practice Packs, Basic Build-Up, Revision Packs, Topical Packs, and LessonTube. The Basic Build-Up module is unique to the Science programme and is designed to solidify the fundamental concepts that underpin every PSLE Science question.

�� Enquire today to secure a slot and get your child started with confidence.

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