34 content lessons covering every Specific Objective in the CXC CSEC Biology syllabus, plus 3 exam-preparation lessons with mock papers and 13 lab-preparation lessons for the SBA. Every lesson has a narrated explainer video, key notes, practice drawn from past CSEC papers, and a readiness score — no login, no install.
Each lesson’s readiness = video watched (20%) + best multiple-choice score (40%) + self-marked structured answers (40%). Each end-of-section test (multiple choice 50% + structured 50%) counts as one lesson in its section. Paper 1 readiness = content lessons (50%) + Paper 1 mock (30%) + lesson E1 (20%). Paper 2 = content lessons (60%) + Paper 2 mock, lesson E2 (40%). Paper 3 = lab lessons (60%) + Paper 03/2 mock, lesson E3 (40%). Overall = Paper 1 × 30% + Paper 2 × 50% + Paper 3 × 20%, the same weights as CSEC. Progress is saved in this browser only.
Every lesson has quick games — sort, sequence, label, match and Myth or Fact. Win XP to level up and unlock badges. Games are practice for fun: they do not change your exam readiness.
| Paper | What it is | Time | Weight |
|---|---|---|---|
| Paper 01 | 60 multiple-choice items across all sections | 1 h 15 min | 30% |
| Paper 02 | 6 compulsory questions: one data-analysis question (25 marks), structured and extended-response questions (15 marks each) | 2 h 30 min | 50% |
| Paper 03/1 (SBA) | Your school’s practical workbook (Paper 03/2 for private candidates) | Over two years | 20% |
Source: CXC CSEC Biology Syllabus, “Format of the Examinations” and Table 1 (raw marks 60 / 100 / 40).
Classification, ecological study, feeding relationships, energy flow, nutrient cycling, human impact and population growth (Specific Objectives A 1.1–7.1).
Quadrats, transects, capture–recapture and collecting equipment — how to choose and use the right sampling method.
Biotic vs abiotic, niche vs habitat, population vs community vs species — and how soil, water and climate affect living things.
Producers, consumers, trophic levels, predator–prey, food webs, ecological pyramids and why only about 10% of energy passes on.
The role of bacteria and fungi, plus parasitism, mutualism and commensalism with Caribbean examples.
How human activity affects natural resources, marine and wetland pollution, coral reefs, and current climate-change trends.
Conserving and restoring the environment, and the factors that control the growth and survival of populations, including humans.
Cells, nutrition, respiration, transport, excretion, movement, irritability, growth, reproduction and disease — the largest section of the syllabus (Specific Objectives B 1.1–10.6).
Plant, animal and bacterial cells, what each organelle does, how to tell plant and animal cells apart, and why multicellular organisms specialise.
How substances move into and out of cells, the potato-well experiment, and why these processes matter in living systems.
Autotrophic, heterotrophic and saprophytic nutrition; the photosynthesis equation; leaf adaptations; limiting factors; nitrogen and magnesium.
Testing for starch, sugars, protein and fat, and why a balanced diet matters — including diet-related diseases common in the Caribbean.
The human alimentary canal, teeth, mechanical and chemical digestion, how enzymes work, the effect of temperature and pH, and what happens after absorption.
How cells release energy from glucose, the role of ATP and enzymes, anaerobic respiration in muscles and yeast, and oxygen debt.
How we inhale and exhale, gas exchange in the alveoli and in leaves, features of exchange surfaces, and the effects of smoking.
Why multicellular organisms need transport, what is transported, the double circulation, the heart and the three types of blood vessel.
Red cells, white cells, platelets and plasma; clotting; phagocytosis and antibodies; natural and artificial immunity and vaccines.
How water travels from soil to leaf, why transpiration matters, the factors that change its rate, water conservation, and translocation in phloem.
What plants and animals store, where they store it, why starch and glycogen are ideal stores, and why storage matters.
Stimulus and response, plant tropisms and invertebrate behaviour, receptors and effectors, the reflex arc, parts of the brain, and the effects of drug abuse.
Structure and function of the eye, accommodation, sight defects and their correction, and how the skin regulates temperature and protects the body.
Sexual vs asexual reproduction, the reproductive systems, the menstrual cycle, fertilisation and development, birth control, HIV/AIDS and gonorrhoea.
Parts of a flower, insect vs wind pollination, pollination vs fertilisation, how fruits and seeds form, and seed dispersal.
DNA, cell division, inheritance, variation, speciation, natural selection and genetic engineering (Specific Objectives C 1.1–6.2).
How DNA, chromosomes, genes and alleles relate; the stages of mitosis; and why asexual reproduction gives identical offspring.
How meiosis halves the chromosome number, where it happens, and how it creates genetic variation through crossing over and independent assortment.
Dominant, recessive, codominance, genotype, phenotype, homozygous, heterozygous — and how to set out a genetic cross that scores full marks.
How X and Y chromosomes determine sex, why the chance of a boy is always 50%, and the inheritance of haemophilia and colour blindness.
How genetic variation arises, why it matters for survival, and the difference between continuous and discontinuous variation.
What a species is, how new species form, Darwin’s theory of natural selection with Caribbean and modern examples, and natural vs artificial selection.
How genes are transferred between organisms, uses in medicine and agriculture, and the advantages, disadvantages and ethical issues.
How each CSEC paper works, exam technique, and full mock papers adapted from the CXC specimen papers: a timed 60-item Paper 1 mock, a 100-mark Paper 2 mock and a 60-mark Paper 03/2 mock.
How Paper 01 is built, how the 60 items spread across the syllabus, techniques for tricky item types, and a timed 60-item mock exam.
The six-question structure, command words, data-analysis and graph skills, how to write extended answers — then a full 100-mark mock paper with mark schemes.
How the School-Based Assessment is marked (skills, marks, investigation, workbook), how Paper 03/2 works for private candidates — then a 60-mark mock 03/2.
Everything the syllabus asks of you in the lab: safety and apparatus, the five SBA skills, and walkthroughs of the seven compulsory practicals plus the specimen Paper 03/2 practicals.
The syllabus safety rules, the equipment you must handle confidently (Bunsen burner, measuring cylinder, thermometer, balance…) and reading instruments accurately.
Using a light microscope, preparing a temporary slide, the syllabus drawing rules and calculating magnification.
The Observation/Recording/Reporting skill: the report format, past-tense passive method, results tables and graphs that earn full marks.
Turning an observation into a testable hypothesis, variables and controls, writing a proposal, and how the investigation project is marked.
Describing trends, doing the calculations (mean, percentage change, density, magnification), explaining results, sources of error, limitations and conclusions.
Planning and carrying out a field study: quadrats, transects, abiotic measurements, recording and presenting data.
Potato or carrot strips in different solutions, the potato well, and Visking tubing — methods, variables, results and explanations.
Destarching, the leaf starch test, testing whether light, chlorophyll and CO₂ are needed, and showing respiration with limewater and yeast.
Step-by-step methods, safety and results for starch, reducing sugar, non-reducing sugar, protein and fat tests — and how to record them.
Investigating the conditions needed for germination, measuring seedling growth, and drawing a dicot seed.
Investigating temperature and pH on amylase or catalase, and nutrition surveys linked to diet-related disease.
Surveys of inherited traits (earlobes, tongue rolling), measuring continuous variation, and bead/coin models of Mendelian crosses.