How to Ace IGCSE Biology — A Unit-by-Unit Study Plan (2026)
IGCSE Biology gets much easier when you stop “reading chapters” and start revising unit-by-unit with exam answers in mind. Biology marks are not only about knowing facts—it’s about using the right keywords, writing clear explanations, and practising the same question styles that appear every year.This guide gives you a unit-by-unit study plan you can follow for Cambridge IGCSE Biology (0610) and most Edexcel IGCSE Biology specs (units may be grouped slightly differently). Use it as a 4–6 week plan, or compress it into 30 days if your exam is close.
Before you start: set up your Biology revision system
You’ll improve fastest if you use this simple system:
1) Make a “Bio Keywords” sheet
For each unit, list:
- key terms (e.g., diffusion, osmosis, active transport)
- definitions in 1 line
- common command words (describe, explain, compare)
2) Use active recall (not rereading)
Best methods:
- blurting (write what you remember, then check)
- flashcards (definitions + processes)
- quick quizzes after every subtopic
3) Build an error log
For every wrong question:
- topic
- what you wrote vs what mark scheme wanted
- missing keyword(s)
- corrected model answer
This is how you stop losing “easy” marks.
Unit-by-Unit Study Plan (What to Study + How to Score)
Unit 1: Cells + Organisation (high frequency)
What to master:
- cell structure (animal/plant/bacteria)
- specialised cells and adaptations
- levels of organisation (cells → tissues → organs → systems)
How to score:
- practise “label + function” questions
- learn 1–2 line definitions (exam-friendly)
Unit 2: Movement of Substances (diffusion, osmosis, active transport)
What to master:
- diffusion vs osmosis vs active transport (differences!)
- factors affecting rate (surface area, temperature, concentration gradient)
- examples in the body (alveoli, villi, root hair cells)
How to score:
- always mention concentration gradient and net movement
- practise graph/data questions (rate changes)
Unit 3: Biological Molecules + Enzymes
What to master:
- carbohydrates, proteins, fats (basic roles)
- enzyme action (lock-and-key / active site)
- effects of temperature and pH
- food tests (Benedict’s, iodine, biuret, ethanol emulsion)
How to score:
- memorise food test result colours
- practise “explain why enzyme stops working” (denaturation keywords)
Unit 4: Plant Nutrition (photosynthesis + leaf adaptations)
What to master:
- word + symbol equation for photosynthesis
- limiting factors (light, CO₂, temperature)
- leaf structure and stomata
- mineral ions (nitrate, magnesium) deficiency symptoms
How to score:
- practise limiting factor graphs
- use correct keywords: “rate”, “limiting”, “optimum”
Unit 5: Human Nutrition + Digestion
What to master:
- balanced diet + deficiency diseases
- digestive system organs + functions
- enzymes (amylase, protease, lipase) and where they work
- absorption in small intestine (villi adaptations)
How to score:
- practise “describe the path of food” questions
- learn villi adaptations (large SA, thin wall, good blood supply, lacteal)
Unit 6: Transport in Plants (xylem/phloem + transpiration)
What to master:
- xylem vs phloem (what they carry + direction)
- transpiration and factors affecting it
- translocation basics
How to score:
- practise comparison tables (xylem vs phloem)
- use keywords: “water potential”, “evaporation”, “diffusion” (if in your syllabus)
Unit 7: Transport in Humans (heart, blood, circulation)
What to master:
- heart structure + blood flow path
- double circulation
- blood components (RBC/WBC/platelets/plasma)
- arteries vs veins vs capillaries
How to score:
- practise “sequence” questions (chambers/valves/vessels)
- learn adaptations (RBC biconcave, no nucleus, haemoglobin)
Unit 8: Respiration + Gas Exchange
What to master:
- aerobic vs anaerobic respiration (equations + differences)
- gas exchange in alveoli (adaptations)
- breathing vs respiration (common confusion)
How to score:
- always use keywords: “large surface area”, “thin walls”, “good blood supply”
- practise short explain questions (why lactic acid forms)
Unit 9: Excretion + Homeostasis
What to master:
- kidney structure (nephron basics)
- urine formation (filtration + reabsorption)
- thermoregulation (sweating, shivering, vasodilation/constriction)
- blood glucose control (insulin/glucagon basics)
How to score:
- practise “describe how body responds” questions
- use cause → response → result structure
Unit 10: Coordination + Response (nervous system, hormones, reflexes)
What to master:
- reflex arc (stimulus → receptor → neurone → effector → response)
- synapse basics (if included)
- endocrine vs nervous system differences
- eye structure + accommodation (if included)
How to score:
- reflex arc questions are predictable—memorise the pathway
- practise labelled diagrams
Unit 11: Reproduction + Inheritance
What to master:
- sexual reproduction (humans + plants)
- menstrual cycle basics (if included)
- DNA, genes, chromosomes
- monohybrid inheritance + Punnett squares
- variation and mutation
How to score:
- practise genetic crosses until they’re automatic
- always show working for ratios and probabilities
Unit 12: Ecology + Human Impacts
What to master:
- food chains/webs, trophic levels, energy loss
- carbon and nitrogen cycles (if included)
- population graphs and sampling methods
- pollution, deforestation, conservation
How to score:
- practise “explain why energy decreases” answers (respiration/heat/waste)
- learn cycle keywords and sequences
A simple weekly timetable (4–6 weeks)
Option A: 6-week plan (best for strong grades)
- Week 1: Units 1–2
- Week 2: Units 3–4
- Week 3: Units 5–6
- Week 4: Units 7–8
- Week 5: Units 9–10
- Week 6: Units 11–12 + full past papers
Option B: 4-week plan (if time is short)
- Week 1: Units 1–3
- Week 2: Units 4–6
- Week 3: Units 7–9
- Week 4: Units 10–12 + 2–3 past papers
How to use past papers (the “ace the exam” method)
For each paper:
- Do it timed
- Mark it strictly
- Rewrite wrong answers using mark scheme keywords
- Add missing keywords to your keyword sheet
- Repeat the same topic questions 2–3 days later
That repetition is what locks in marks.
FAQs
Is this plan for Cambridge 0610 or Edexcel IGCSE Biology?
It fits both broadly, but unit names and depth can vary. If you tell me your board, I can reorder units and highlight what’s most tested.
How many past papers should I do to get a top grade?
Aim for 6–10 full papers in total, but only if you correct them deeply. Two well-corrected papers are better than five rushed ones.
How do I stop losing marks even when I “know the topic”?
Because Biology marking is keyword-based. Build a keyword sheet + rewrite answers using the mark scheme language.
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