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PSLE 2026 · Complete Checklist

PSLE Science 2026 Topic Checklist: All 5 Themes, Notes & Free PDF

Every topic, every subtopic, and every key concept you need for PSLE Science 2026 — organised by theme and priority level.

PSLE Science 2026 Topic Checklist: All 5 Themes, Notes & Free PDF

📅 Updated May 2026 · Aligned to MOE 2026 syllabus
⚠️ Updated for MOE 2026 Syllabus: This checklist reflects the revised MOE Primary Science Syllabus (2023), which is examined at PSLE from 2026 onwards. The most important change: the Cells REMOVED 2026 topic has been removed and will not be tested. Topics are now assigned to fixed levels (no more Lower/Upper Block). The exam places greater emphasis on scientific inquiry skills — fair tests, data interpretation, and structured explanations.

One of the biggest challenges in preparing for PSLE Science is knowing what to study. The MOE syllabus covers topics from P3 all the way to P6, and it can be hard to know which ones will appear in your exam and how much depth you need. This checklist covers every topic in the PSLE Science syllabus, organised by theme, with key concepts for each. Use it to audit your knowledge and plan your revision.

How to use this checklist: Go through each topic and ask yourself, "Can I explain this concept in a full sentence using the correct scientific vocabulary?" If yes, tick it off. If no, it goes on your revision list. Be honest with yourself — partial knowledge often leads to partial marks.

How PSLE Science 2026 Is Structured — Paper Format & Mark Weightings

PSLE Science tests knowledge and skills from the following levels:

The five themes that organise all these topics are: Diversity, Systems, Cycles, Interactions, and Energy.

Theme 1: Diversity — PSLE 2026 Topics, Notes & Key Questions

Diversity questions ask you to classify, compare, and explain the differences between living things and materials. This theme appears in almost every PSLE paper.

Theme 2: Systems — PSLE 2026 Topics, Notes & Key Questions

Systems questions test your understanding of how organs or components work together. The digestive, respiratory, and transport systems are particularly high-priority.

Theme 3: Cycles — PSLE 2026 Topics, Notes & Key Questions

Cycles questions test your ability to describe, explain, and connect the stages of natural recurring processes.

Theme 4: Interactions — PSLE 2026 Topics, Notes & Key Questions

Interactions questions are among the most analytical at PSLE — they ask you to trace cause-and-effect relationships through ecosystems and physical systems.

Theme 5: Energy — PSLE 2026 Topics, Notes & Key Questions

Energy questions ask you to explain how energy is transferred, transformed, and its practical implications.

⚠️ Highest-Priority Topics for 2026

Based on the pattern of recent PSLE Science papers, these topics appear most frequently and at higher mark values: Photosynthesis, Food Chains and Food Webs, The Digestive System, The Water Cycle, Adaptations, Life Cycles, and Electrical Circuits. These 7 topics should receive the most revision time for every P6 student.

📋 Revision Checklist Summary

  • Theme 1 (Diversity): MRS GREN, 5 vertebrate groups, materials and properties
  • Theme 2 (Systems): photosynthesis, digestive system, electrical systems, respiratory system
  • Theme 3 (Cycles): life cycles (complete + incomplete), water cycle, states of matter
  • Theme 4 (Interactions): food chains/webs, adaptations, magnets, forces
  • Theme 5 (Energy): heat, light, electrical energy
  • Use ScienceStar quizzes and flashcards to test each topic after revision
  • Paper 2 (OEQ): 44 marks — always use correct keywords and explain mechanisms

Ready to test yourself? Try the quiz →

Explore: P3 · P4 · P5 · PSLE · All Articles

🧠 Key Points to Remember
  • 5 themes: Diversity, Systems, Cycles, Interactions, Energy
  • PSLE Science = Paper 1 (56 marks MCQ) + Paper 2 (44 marks open-ended)
  • High-frequency topics: Food Webs, Adaptations, Electricity, Water Cycle, Photosynthesis
  • Paper 2 rewards science keywords + causal reasoning + complete answers
  • Experiment questions test: variables (MV/RV/CV), hypothesis, fair test, reliability
  • Start revision with content gaps, then move to past papers under timed conditions
  • All P3–P6 topics are tested — don't neglect lower primary content
📝

Practice Questions

📝 Practice Question 1
Name the five themes of the PSLE Science 2026 syllabus and briefly explain what each theme covers.
(5 marks)
▼ Show Answer
✅ (1) Diversity — the variety of living and non-living things, and how they are classified. (2) Systems — how body systems (digestive, respiratory) and physical systems (circuits) work together. (3) Cycles — repeating processes such as life cycles, the water cycle, and changes of state. (4) Interactions — how organisms interact with each other (food webs, adaptations) and how forces interact with objects. (5) Energy — how energy is transferred or transformed through heat, light, and electricity.
📝 Practice Question 2
A P6 student has 8 weeks left before her PSLE. She scores well on Paper 1 (MCQ) but loses many marks on Paper 2 (open-ended). How should she prioritise her remaining revision time?
(3 marks)
▼ Show Answer
✅ She should spend the majority of her remaining time on Paper 2 skills: (1) Practising open-ended questions with the Because-Therefore structure, (2) Reviewing examiner mark schemes to understand what keywords are expected, (3) Drilling experiment/fair test questions which are a consistent part of Paper 2. She should also identify her 2–3 weakest content topics and do a focused review of those, while maintaining her Paper 1 skills through regular short MCQ practice.
📝 Practice Question 3
Which PSLE Science theme is most likely to be tested in an experiment-design question? Give a reason.
(2 marks)
▼ Show Answer
✅ The Interactions theme (particularly Food Webs and Ecosystems, and Forces) or the Cycles theme (particularly Evaporation Rate) are most commonly used as experiment contexts. Experiment questions require a variable that can be changed and measured — topics like 'factors affecting evaporation rate' or 'the effect of force on a spring' provide clear manipulated and responding variables.
✅
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Download: PSLE Science 2026 — Revision Notes (PDF)

Free printable notes covering all key concepts, definitions and exam tips from this page.

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📖 Related Topics

→ Last Minute PSLE Revision Guide — Traps, Definitions, Strategy & 48-Hour Checklist → Last Minute PSLE Revision — 48-Hour Checklist & Top 10 Exam Traps → How to Revise PSLE Science 2026 — 12-Week Plan & Strategies → PSLE Open-Ended Questions — The Because-Therefore Structure → PSLE Experiment Questions — Variables, Hypothesis & Fair Tests → Animal Adaptations PSLE — Theme 1: Diversity → Electricity & Circuits P4 — Theme 5: Energy → Ecosystems & Environment — Theme 4: Interactions

🚀 Your Next Step

📅
Build Your Revision Plan
Use this checklist with the 12-week plan to structure your prep.
✏️
Master Open-Ended Questions
The highest-yield skill improvement for PSLE Science Paper 2.
🔬
Practise Experiment Questions
Experiment questions appear in every PSLE Science paper.
🚨
Final Revision Guide
10 exam traps, key definitions and a 48-hour checklist for PSLE day.
📝 O-Level Exam Practice
Free Mock Papers — Chemistry, Physics & Biology
40 MCQ · 1-hour timed · auto-marked with full explanations
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PSLE Science 2026 — What Every Topic Requires You to Know

The MOE PSLE Science syllabus for 2026 is organised into five major themes: Diversity, Systems, Cycles, Interactions, and Energy. Every question in both Section A (MCQ) and Section B (open-ended) comes from within these five themes. Understanding which theme a question belongs to helps you apply the right framework and keywords when answering, even if the specific scenario is unfamiliar.

Theme 1 — Diversity

Covers: Living and Non-Living Things, Fungi and Bacteria, Plants (classification), Animals (classification), Materials. For PSLE, you need to know how to classify organisms and materials based on observable characteristics. Key skills: using and constructing classification keys, explaining how a feature is used to group organisms, and distinguishing living from non-living things using MRS GREN. You also need to know the properties of common materials and how these properties determine their uses.

Theme 2 — Systems

Covers: Plant System (parts and functions, transport, photosynthesis), Human System (digestive, respiratory, circulatory), Electrical System (circuits, conductors, insulators). This is the largest and most heavily tested theme. For each system, you need to know the components, their individual functions, and how they work together as a whole. Key skills: explaining why removing one part of a system affects the whole, predicting what happens when a component changes (e.g. adding a bulb to a series circuit), and answering diagram-based questions labelling structures and functions.

Theme 3 — Cycles

Covers: Life Cycles (plants and animals — complete and incomplete metamorphosis), Water Cycle, Matter Cycles (states of matter and changes). For life cycles, know the stages of complete metamorphosis (egg, larva, pupa, adult) and incomplete metamorphosis (egg, nymph, adult), and examples of each. For the water cycle, know the four processes — evaporation, condensation, precipitation, and collection — and be able to describe the full cycle. For matter, know how heating and cooling cause changes of state and be able to name all changes of state correctly.

Theme 4 — Interactions

Covers: Food Chains and Food Webs, Adaptations, Forces (gravity, friction, elastic spring force), Magnets. For food chains, know how to construct a food chain from given information, identify the roles of all organisms, and predict population changes in a food web. For forces, know the three PSLE forces, their properties (contact vs non-contact), and their effects on objects. For magnets, know which materials are magnetic, the rules of poles, and what induced magnetism means.

Theme 5 — Energy

Covers: Light (reflection, refraction, shadows, opaque/translucent/transparent), Heat (conduction, insulation, expansion, contraction). For light, know how shadows are formed, the conditions for reflection and refraction, and how to classify materials. For heat, know the difference between heat and temperature, good and poor conductors and insulators of heat, and how heat causes expansion in solids, liquids, and gases. These topics appear in P3 and P4 and occasionally in PSLE papers as well.

How to Use This Checklist Effectively

Go through each theme and honestly rate your confidence level: strong, okay, or weak. Spend 70 percent of your revision time on your weak topics and 30 percent reinforcing your strong ones. For each weak topic, use the following approach: read the study notes on ScienceStar, complete the topic quiz, note down the keywords you missed, and then attempt 3 to 5 exam-style questions without notes. Only move on to the next topic when you can answer questions without referring to your notes at all.

⭐ Smart revision strategy: Do not revise topics in the order they appear in your textbook. Instead, prioritise by exam frequency. Forces and Electrical Systems appear in every PSLE paper — revise these first and most thoroughly. Food Chains and Photosynthesis appear in almost every paper — these are second priority. Light, Magnets, and Heat are lower frequency — revise these last, or focus only on the specific sub-topics you know are weak.

How to Use This PSLE 2026 Checklist — Syllabus Changes & Revision Strategy

A checklist is only useful if you use it as a testing tool, not a reading list. For each topic on this checklist, the question is not "have I read about this?" but "can I answer a Booklet B question on this without any notes?" Before ticking a topic as complete, try writing a two-paragraph explanation of it from memory, then check your notes to see what you missed. The gaps between what you wrote and what you should have written are your real revision targets — not the topics themselves.

The 2026 syllabus changes are significant and affect how you should prioritise your revision time. The Cells topic — which covered cell structure, the parts of a cell (nucleus, cell membrane, cell wall, chloroplast, vacuole), and differences between plant and animal cells — has been completely removed. Do not spend any time revising it if you are sitting PSLE in 2026 or later. Energy Conversion has been added — you need to know common energy conversion chains (chemical to electrical to light in a torch; light to chemical in photosynthesis; electrical to kinetic to sound in a fan with motor) and understand that energy is never created or destroyed, only converted from one form to another.

Questions students ask

How should I use this checklist with my school revision schedule?

Use it to identify gaps before school exams and to prioritise revision. After each school test, update the checklist based on which topics appeared and how confident your answers were. The PSLE checklist should be reviewed at least three times: once at the start of P6 to set priorities, once after mid-year exams to reassess, and once in the final four weeks before PSLE to confirm all topics are solid.

My school has not covered some of these topics yet — should I self-study them?

Teachers typically cover all syllabus topics before PSLE, but if a topic you know will be tested has not yet been covered in class, self-studying using ScienceStar's notes is a perfectly valid approach. PSLE can include questions on any topic in the syllabus regardless of when it was taught in school — no topic can safely be left until the exam to see whether it appears.