Master O-Level Biology — one 30-minute lesson at a time

SG Bio Unlocked is the complete two-year GCE O-Level / G3 Combined Science Biology programme built for Singapore Sec 3 and 4 students — covering every MOE syllabus topic through vivid real-world stories, visual summaries, audio recaps, and full mock papers, so you walk into the exam hall knowing exactly what to write.

91 lessonsAI-adaptiveCancel anytimeLearn anywhere

Biology only clicks when it feels alive — so every lesson I teach connects the syllabus to the Singapore you already know and live in.

— Tuition on Demand Academy

What you'll learn

What you'll be able to do

Confidently explain all core MOE GCE O-Level / G3 Combined Science Biology topics — from cell structure and biological molecules through to ecology and genetic inheritance — exactly as scoped by the official syllabus.
Apply biological concepts to real-world Singapore contexts: disease control, food technology, biotechnology, and environmental conservation.
Interpret and draw biological diagrams, label microscope slides, and construct accurate scientific explanations using precise terminology examiners reward.
Answer every question type in the Combined Science Biology paper — structured questions, data-response, and free-response — using proven exam technique and command-word strategies.
Attempt full-length timed mock examination papers that mirror the actual O-Level / G3 format, review mark-scheme feedback, and identify personal areas for improvement.
Build study independence through a clear two-year weekly schedule of 30-minute lessons, self-check quizzes, summary posters, and audio recaps that fit around a full school timetable.

How it works

A school that adapts to you

This isn't a set of static videos. Every lesson is generated live and tuned to where you actually are.

We learn your level

A quick placement check tailors your starting point so you're never bored or lost.

Lessons adapt as you go

Each lesson is written for your pace and your goal, adjusting as your skills grow.

Your AI coach keeps you moving

Checkpoints, feedback, and gentle nudges turn progress into a real result.

The curriculum

What's inside your school

11 modules · 91 lessons

Cell Biology & the Organisation of Life

Builds the essential foundation by exploring cell structure, cell processes, and how cells organise into tissues, organs, and systems.

1.1Welcome to Biology — Why It Matters to YouIncluded
1.2Cells Under the MicroscopeIncluded
1.3Cell Structures & Their JobsIncluded
1.4Specialised Cells in ActionIncluded
1.5From Cells to Systems — Levels of OrganisationIncluded
1.6Movement In and Out of Cells — DiffusionIncluded
1.7Osmosis — Water on the MoveIncluded
1.8Active Transport — Working Against the GradientIncluded
1.9Lesson Review & Visual SummaryIncluded

Biological Molecules & Nutrition

Explores the essential molecules of life and how humans and plants obtain, digest, and use nutrients for energy and growth.

2.1The Big Four — Carbohydrates, Proteins, Fats, and WaterIncluded
2.2Testing for Biological MoleculesIncluded
2.3Enzymes — Nature's CatalystsIncluded
2.4Factors Affecting Enzyme ActivityIncluded
2.5A Balanced Diet and MalnutritionIncluded
2.6Human Digestion — Mouth to Small IntestineIncluded
2.7Absorption and Assimilation in the Small IntestineIncluded
2.8Plant Nutrition — PhotosynthesisIncluded
2.9Factors Affecting the Rate of PhotosynthesisIncluded
2.10Module Review, Poster Recap & QuizIncluded

Transport Systems in Humans and Plants

Examines how blood, the heart, and plant vascular tissue move essential substances to where they are needed.

3.1Blood — What's in It and What It DoesIncluded
3.2The Heart — Structure and the Cardiac CycleIncluded
3.3Blood Vessels — Arteries, Veins, and CapillariesIncluded
3.4Cardiovascular Disease — Risks and PreventionIncluded
3.5Lymph and the Lymphatic SystemIncluded
3.6Plant Transport — Xylem and PhloemIncluded
3.7Transpiration and the Transpiration StreamIncluded
3.8Module Review, Audio Recap & Exam QuestionsIncluded

Respiration, Gas Exchange & Excretion

Covers how organisms release energy from glucose, exchange respiratory gases, and remove metabolic waste products.

4.1Aerobic Respiration — Energy for LifeIncluded
4.2Anaerobic Respiration — When Oxygen Runs OutIncluded
4.3The Human Breathing SystemIncluded
4.4Gas Exchange in the AlveoliIncluded
4.5Effects of Smoking on the Breathing SystemIncluded
4.6Gas Exchange in Plants and FishIncluded
4.7Excretion — Why Waste Removal MattersIncluded
4.8The Kidneys — Overview of Urine FormationIncluded
4.9Module Review, Poster & Structured Question PracticeIncluded

Coordination, Response & Homeostasis

Explores how the nervous system detects stimuli, coordinates responses, and maintains stable internal conditions within syllabus scope.

5.1Sensitivity — Detecting the World Around UsIncluded
5.2The Nervous System — An OverviewIncluded
5.3Neurones and the SynapseIncluded
5.4Reflex Arcs — Fast, Automatic ResponsesIncluded
5.5Homeostasis — Keeping the Body in BalanceIncluded
5.6Thermoregulation — Too Hot, Too ColdIncluded
5.7Hormonal Control — An IntroductionIncluded
5.8Drugs and the Nervous SystemIncluded
5.9Module Review, Audio Summary & QuizIncluded

Reproduction and Growth

Covers sexual and asexual reproduction, growth patterns, and the structures involved in human and plant reproduction at syllabus level.

6.1Asexual vs Sexual Reproduction — Pros and ConsIncluded
6.2The Male and Female Reproductive SystemsIncluded
6.3Fertilisation, Pregnancy, and Ante-natal CareIncluded
6.4Growth — Measuring and Interpreting Growth CurvesIncluded
6.5Module Review, Diagrams & Exam PracticeIncluded

Genetics and Inheritance

Introduces chromosomes, genes, cell division, and the principles of inheritance to explain how traits pass from parent to offspring.

7.1DNA, Genes, and ChromosomesIncluded
7.2Mitosis — Growing and RepairingIncluded
7.3Meiosis — Making Sex CellsIncluded
7.4Monohybrid Inheritance — One Trait at a TimeIncluded
7.5Codominance and Multiple AllelesIncluded
7.6Sex Determination and Sex-Linked InheritanceIncluded
7.7Mutation — Changes to the Genetic CodeIncluded
7.8Module Review, Genetics Poster & Exam QuestionsIncluded

Biotechnology and Genetic Engineering

Explores how scientists manipulate genes and organisms for medicine, agriculture, and food technology, with real Singapore and global applications.

8.1What Is Biotechnology? — Old and NewIncluded
8.2Fermentation — Microbes at WorkIncluded
8.3Genetic Engineering — Cutting, Copying, and InsertingIncluded
8.4GM Organisms — Benefits and RisksIncluded
8.5Selective Breeding and Its ApplicationsIncluded
8.6Cloning — Plants, Animals, and Stem CellsIncluded
8.7Module Review, Real-World Links & Structured QuestionsIncluded

Ecology and the Environment

Examines ecosystems, energy flow, nutrient cycles, human impact, and conservation — with a strong focus on Singapore and Southeast Asian contexts.

9.1Ecosystems — Biotic and Abiotic FactorsIncluded
9.2Food Chains, Food Webs, and Trophic LevelsIncluded
9.3Energy Flow and Ecological PyramidsIncluded
9.4The Carbon CycleIncluded
9.5The Nitrogen CycleIncluded
9.6Human Impact — Pollution and Habitat LossIncluded
9.7Conservation — Protecting BiodiversityIncluded
9.8Population Growth and Sustainable Resource UseIncluded
9.9Module Review, Ecology Poster & Exam PracticeIncluded

Practical Skills, Scientific Method & Data Handling

Develops the investigation design, data analysis, and graph interpretation skills tested across all sections of the Combined Science paper.

10.1Planning a Fair InvestigationIncluded
10.2Biological Drawing and LabellingIncluded
10.3Tables, Graphs, and Data PresentationIncluded
10.4Analysing Results and Evaluating ExperimentsIncluded
10.5Using a Microscope and Preparing SlidesIncluded
10.6Command Words — Decoding What the Examiner WantsIncluded
10.7Practical Skills Review & Data-Response Exam PracticeIncluded

Exam Preparation — Practice, Strategy & Mock Papers

Pulls every topic together through targeted revision, exam technique coaching, timed mock papers, and personalised feedback for exam-day confidence.

11.1Revision Strategy — How to Study SmarterIncluded
11.2Topic Blitz — Cells, Molecules & TransportIncluded
11.3Topic Blitz — Respiration, Coordination & ReproductionIncluded
11.4Topic Blitz — Genetics, Biotechnology & EcologyIncluded
11.5Mock Paper 1 — Full Timed ExaminationIncluded
11.6Mock Paper 1 — Mark Scheme Review and FeedbackIncluded
11.7Mock Paper 2 — Full Timed ExaminationIncluded
11.8Mock Paper 2 — Mark Scheme Review and Targeted RevisionIncluded
11.9Last-Minute Essentials — Key Diagrams and DefinitionsIncluded
11.10You're Ready — Final Confidence BuilderIncluded

Who it's for

Is this you?

The Sec 3 Fresh Starter

Starting the two-year syllabus from day one and wants a structured, confidence-building programme that keeps pace with school from the very beginning.

The Sec 4 Consolidator

Racing toward O-Levels and needs to close gaps fast — the Topic Blitz lessons, mock papers, and mark-scheme reviews are exactly what this student came for.

The Supportive Parent

Wants to understand the MOE syllabus well enough to guide study sessions at home and spot early when their child needs extra help on a topic.

The Private Tutor

Needs a rigorous, syllabus-aligned backbone for Combined Science Biology sessions that already comes with practice questions, visual summaries, and exam technique built in.

The Busy CCA Achiever

Committed to co-curricular activities and needs bite-sized 30-minute lessons plus audio recaps that fit biology revision into whatever pocket of time the day allows.

The Self-Study Independent Learner

Prefers learning at her own pace outside the classroom and loves having a clear weekly schedule, self-check quizzes, and poster summaries to keep herself on track without a tutor.

Questions

Frequently asked

Your teacher

A note from your teacher

Tuition on Demand Academy

I know exactly what it feels like to sit in a biology lesson, stare at a diagram of the nephron or a genetics cross, and think: I just don't get it. Not because you're not smart enough — you absolutely are — but because nobody connected it to anything real. Nobody told you that osmosis is literally what happens to your red blood cells when you eat too much salt, or that the fermentation unit you're studying is the same science behind the kaya your grandmother spreads on toast every morning.

That's what SG Bio Unlocked is built to fix. I designed this programme specifically for Singapore Sec 3 and 4 students working toward the GCE O-Level / G3 Combined Science Biology paper — and I built it around one core belief: biology only clicks when it feels alive. Every lesson in this programme starts with something real. Dengue outbreaks and the Aedes mosquito lifecycle when we study disease. Singapore's food innovation scene when we explore biotechnology and GM organisms. Our own reservoirs and nature reserves when we tackle ecology and conservation. Real contexts don't just make lessons more interesting — they make the science memorable, and memorable science is what you recall under exam pressure.

I also know that you're not just a biology student. You're juggling school, CCAs, other subjects, family commitments, and probably a social life you'd like to actually have. So I didn't build a programme that demands enormous daily blocks of time. Every lesson is 30 minutes. There's a clear weekly schedule for all of Sec 3 and Sec 4. There are audio recaps for the bus ride home and visual summary posters you can stick above your desk. The programme works around your life — not the other way around.

And here's the thing I feel most strongly about: knowing the biology is not enough on its own. I've seen students who genuinely understood the content walk out of the exam hall disappointed, because they didn't know how to write for a marker. That's why exam technique is woven into this programme from the very beginning — not bolted on at the end. You'll learn what 'explain' actually demands versus 'describe', how to structure a free-response answer so every mark point lands, how to read a data-response question without panicking, and how to use the two full-length timed mock papers (with full mark-scheme reviews) to identify exactly what to tighten before the real day.

I built SG Bio Unlocked because I believe every student — regardless of whether they're starting fresh in Sec 3 or scrambling to consolidate in Sec 4 — deserves a clear, warm, well-structured path through this syllabus. You don't need to be a 'science person.' You just need the right guide and the willingness to show up for 30 minutes a day. I'll take care of the rest. Come join us — let's make biology the grade you're proud of. 🌱