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Ikiodiete George
- 3 Min Read
Waec Marking Scheme For Science Subjects: Biology, Chemistry, And Physics (2025/2026 Guide)
Passing WAEC science subjects like Biology, Chemistry, and Physics requires more than just knowing formulas or definitions. It’s about understanding how WAEC awards marks in both objective and theory sections.
WAEC rewards method, presentation, and logical steps — not just final answers.
In this guide, you'll get:
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Full breakdown of the marking schemes
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Tips to score method marks
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Tables showing how questions are graded
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Smart ways to answer for maximum scores
WAEC Science Papers Structure
| Subject | Paper 1 | Paper 2 | Paper 3 (Practical) |
|---|---|---|---|
| Biology | 50 Objective Questions (50 marks) | Essay/Theory – 6 out of 6 (60 marks) | Practical on Specimens (50 marks) |
| Chemistry | 50 Objective Questions (50 marks) | Theory – 4 Structured Questions (50 marks) | Practical (50 marks) |
| Physics | 50 Objective Questions (50 marks) | Theory – 4 Structured Questions (50 marks) | Practical (50 marks) |
WAEC Biology Marking Scheme
Paper 1: Objective (50 Marks)
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50 multiple-choice questions
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Each correct answer = 1 mark
No negative marking, so attempt every question.
Paper 2: Theory (60 Marks)
Answer all 6 questions. Here's how each is marked:
| Section | Marks |
|---|---|
| Correct Definitions | 2–3 marks per term |
| Labelled Diagrams | 4–6 marks |
| Explanations/Functions | 4–10 marks depending on depth |
| Use of Scientific Terms | 1–3 marks for accuracy |
Use bullet points, label diagrams clearly, and follow question instructions.
Paper 3: Practical (50 Marks)
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3 questions (based on 3 specimens or experiments)
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Each question carries 15–20 marks
| What Examiners Check | Marks Awarded |
|---|---|
| Accurate labeling | 3–5 marks |
| Observations | 5–7 marks |
| Identification/classification | 3–5 marks |
| Drawing quality | 4–6 marks |
Avoid rough sketches and always title your drawings.
WAEC Chemistry Marking Scheme
Paper 1: Objective (50 Marks)
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50 questions covering inorganic, organic, and physical chemistry
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Each question = 1 mark
Paper 2: Theory (50 Marks)
Answer 4 structured questions:
| Type | Marks |
|---|---|
| Definitions/Terms | 2 marks each |
| Chemical Equations | 3–5 marks |
| Calculation-based Questions | 5–10 marks |
| Explanations/Processes | 4–6 marks |
Units must be included in answers to numerical problems.
Paper 3: Practical (50 Marks)
Includes qualitative and quantitative analysis.
| Component | Marks |
|---|---|
| Observation of reactions | 5–7 marks |
| Balanced chemical equations | 4–6 marks |
| Inference and conclusion | 4–5 marks |
| Accuracy in titration | 5–7 marks |
Examiners reward neat, logical procedures and accurate calculations.
WAEC Physics Marking Scheme
Paper 1: Objective (50 Marks)
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50 MCQs from mechanics, optics, waves, electricity, etc.
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Each question = 1 mark
Paper 2: Theory (50 Marks)
Answer 4 questions from 6:
| Question Element | Marks |
|---|---|
| Correct formula | 2 marks |
| Substitution with units | 2 marks |
| Final correct answer | 2 marks |
| Diagrams (if needed) | 2–4 marks |
| Interpretation/analysis | 4–6 marks |
Always state formulas and show every step in calculations.
Paper 3: Practical (50 Marks)
Covers measurement, graphs, and circuit experiments.
| Component | Marks |
|---|---|
| Accurate measurements | 4–6 marks |
| Graph plotting | 6–8 marks |
| Interpretation of results | 4–6 marks |
| Procedure and precautions | 4–5 marks |
Use sharp pencils and clear scales for graph work.
Tips to Score High in Science WAEC Papers
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Show all steps in calculations — don’t skip formulas.
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Label diagrams clearly with arrows and titles.
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Don’t cram — understand concepts, especially in practicals.
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Follow instructions strictly (e.g., “use 3 decimal places”).
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Use your own words in theory — avoid textbook copying.
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Be time-conscious during both theory and practicals.
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Revise WAEC past questions with marking guides.
Frequently Asked Questions (FAQs)
Q: Can I pass WAEC science subjects without perfect answers?
Yes. WAEC rewards method and effort, not just the final answer.
Q: What if I draw the wrong diagram in Biology or Physics?
You may lose marks. Always double-check labels and relevance.
Q: Are calculators allowed in Physics and Chemistry?
Yes. Scientific calculators are allowed and recommended.
Q: Will spelling affect my marks in theory papers?
Yes — especially for scientific terms in Biology and Chemistry.
Final Words
Knowing how WAEC marks Biology, Chemistry, and Physics helps you answer smartly and avoid avoidable errors.
Don’t aim to be perfect — aim to follow the marking scheme.
With consistent practice, clear presentation, and an understanding of how marks are awarded, you’ll be on your way to A1s in all science subjects.
