IGCSE syllabus
Every IGCSE Biology Extended skill maps to a topic in the syllabus, so sessions cover what the exams test.

IGCSE Biology Extended
Pioneered by Stanford AI researchers and learning scientists, Aristotle is the world's first voice-based AI tutor. Built for the IGCSE Biology Extended syllabus and exams.
Trusted by families at
Fits your child's IGCSE Biology Extended class
Every IGCSE Biology Extended skill maps to a topic in the syllabus, so sessions cover what the exams test.
Share your teacher's syllabus, textbook, or pacing guide and sessions follow your child's actual class.
Aiming for an A*? Aristotle plans review back from your child's target grade and exam date.
Exam prep
Aristotle tracks 421 IGCSE Biology Extended skills, finds the ones costing your child points, and plans review back from exam day.
Follows the syllabus, unit by unit.
Your child talks it through. Aristotle coaches from the step that went wrong.
Any time before the exam. No booking.
See what's mastered and what's left.
Features
Talk things through, work side by side, and come back next time to a tutor who remembers where you left off.
Ask questions out loud, hear explanations in Aristotle’s voice, and interrupt whenever you need to.
Aristotle draws steps, diagrams, and images to help you learn visually.
Get practice problems tailored to the exact topics you’re struggling with.
From middle-school math to AP exams to SAT/ACT prep. We also build custom plans matched to state standards and specific courses.
Revisit session summaries, session whiteboards, and uploads in one place.
Aristotle can read and navigate any PDFs and images with the learner. That includes textbooks with hundreds of pages!
We break all subjects down into granular skills, then track mistakes and mastery on each one. Parents can see the whole picture at a glance.
Aristotle remembers every session: what you’ve covered, where you got stuck, how you like things explained. It picks up right where you left off.
The curriculum
Aristotle is designed to always know what to teach at exactly the right time.
Sample curriculum
* Click a topic to see the skills inside
Characteristics and Classification of Living Organisms
Organisation of the Organism
Movement Into and Out of Cells
Biological Molecules
Enzymes
Plant Nutrition
Human Nutrition
Transport in Plants
Transport in Animals
Diseases and Immunity
Gas Exchange in Humans
Respiration
Excretion in Humans
Coordination and Response
Drugs
Reproduction
Inheritance
Variation and Selection
Organisms and Their Environment
Human Influences on Ecosystems
Biotechnology and Genetic Modification
IGCSE Biology Extended tutoring curriculum421 skills across 21 units
Characteristics and Classification of Living Organisms
Topics: Characteristics of Living Organisms, Concept and Uses of Classification Systems, Features of Organisms.
Organisation of the Organism
Topics: Cell Structure, Size of Specimens.
Movement Into and Out of Cells
Topics: Diffusion, Osmosis, Active Transport.
Biological Molecules
Topics: Biological Molecules.
Enzymes
Topics: Enzymes.
Plant Nutrition
Topics: Photosynthesis, Leaf Structure.
Human Nutrition
Topics: Diet, Digestive System, Physical Digestion, Chemical Digestion, Absorption.
Transport in Plants
Topics: Xylem and Phloem, Water Uptake, Transpiration, Translocation.
Transport in Animals
Topics: Circulatory Systems, Heart, Blood Vessels, Blood.
Diseases and Immunity
Topics: Diseases and Immunity.
Gas Exchange in Humans
Topics: Gas Exchange in Humans.
Respiration
Topics: Respiration, Aerobic Respiration, Anaerobic Respiration.
Excretion in Humans
Topics: Excretion in Humans.
Coordination and Response
Topics: Coordination and Response, Sense Organs, Hormones, Homeostasis, Tropic Responses.
Drugs
Topics: Drugs.
Reproduction
Topics: Asexual Reproduction, Sexual Reproduction, Sexual Reproduction in Plants, Sexual Reproduction in Humans, Sex Hormones in Humans, Sexually Transmitted Infections.
Inheritance
Topics: Chromosomes, Genes and Proteins, Mitosis, Meiosis, Monohybrid Inheritance.
Variation and Selection
Topics: Variation, Adaptive Features, Selection.
Organisms and Their Environment
Topics: Energy Flow, Food Chains and Food Webs, Nutrient Cycles, Populations.
Human Influences on Ecosystems
Topics: Food Supply, Habitat Destruction, Pollution, Conservation.
Biotechnology and Genetic Modification
Topics: Biotechnology and Genetic Modification, Biotechnology, Genetic Modification.
A few things you might wonder before getting started.
Aristotle's IGCSE Biology Extended course tracks 421 skills across 21 units, mapped to the IGCSE syllabus, including Characteristics and Classification of Living Organisms, Organisation of the Organism, and Movement Into and Out of Cells. Every skill is linked to the skills it builds on, so the tutor always knows which parts of IGCSE Biology Extended your child has mastered and what to teach next.
Check out our most recent blog posts.

This could be you
For homework, supporting your child, or anything you’ve always wanted to know more about, Aristotle makes it easy for anyone to learn out loud.