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 ISLAC International Exam Prep is a free online learning platform for students preparing for international examinations, including IGCSE Edexcel Physics, Mathematics, Chemistry, Biology, Business, Economics and Computer Science, as well as IELTS.

We combine three things to help you learn: structured video lessons on our YouTube channel (ISLAC), auto-graded practice quizzes in Google Classroom where you can check your answers and explanations instantly, and written notes and past-paper walkthroughs on this blog, organised by subject. Our goal is simple: to make high-quality exam preparation accessible to every student, anywhere in the world, free of charge.

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Photosynthesis Explained – IGCSE & O Level Biology (Video Lesson)

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How do plants turn sunlight into food? Photosynthesis is one of the most important reactions on Earth – it feeds almost every living thing and puts the oxygen into the air we breathe. This is a full, exam-focused guide for IGCSE & O Level Biology . Watch the video above, then use the notes below to revise. The big picture: light, water and carbon dioxide go in; glucose and oxygen come out. Image: Wikimedia Commons. 1. What is photosynthesis? Photosynthesis is the process by which green plants, algae and some bacteria use light energy (absorbed by chlorophyll ) to make glucose from carbon dioxide and water . Oxygen is released as a by-product. In short, light energy is transformed into chemical energy stored in glucose. Word equation carbon dioxide + water  —(light energy / chlorophyll)→  glucose + oxygen Balanced symbol equation 6CO 2 + 6H 2 O  →  C 6 H 12 O 6 + 6O 2 (in the presence of light energy and chlorophyll) 2. The raw materia...
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Demand & Supply Explained — IGCSE Economics (Curves, Shifts & Equilibrium)

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Demand and supply is the core model of microeconomics — and one of the most heavily tested topics in IGCSE Economics. Get it right and you can explain how almost any price in the real world is set. This lesson covers the demand and supply curves , the difference between a movement and a shift , and how markets reach equilibrium . What is a market? A market is any arrangement that brings buyers and sellers together. Goods flow one way; money flows the other. Demand and effective demand Demand is not just wanting something. It must be backed by the ability to pay — that is effective demand . The law of demand says that, all else equal, price and quantity demanded move in opposite directions. Plot price against quantity and the demand curve slopes downward from left to right. Movement vs shift (demand) A change in the good's own price causes a movement along the curve — an expansion or contraction of demand. Anything other than the good's own pri...
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Logic Gates Explained - IGCSE / O-Level Computer Science (AND, OR, NOT, NAND, NOR, XOR)

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Every computer, phone and games console makes billions of decisions every second — using nothing but 1s and 0s . The components that make those decisions are called logic gates . This lesson covers all six gates you need for IGCSE / O-Level Computer Science, their truth tables, Boolean notation, and how to combine them into real circuits. AND OR NOT Binary: 1 and 0 In digital logic, 1 = TRUE / ON / HIGH voltage, and 0 = FALSE / OFF / LOW voltage. Every input and output of a logic gate is always one of these two values. What is a logic gate? A logic gate is an electronic component with one or more binary inputs and exactly one binary output . It follows a fixed rule, described by a truth table — a list of every input combination and the output it gives. The six logic gates Gate Rule Notation NOT Flips the input (0 to 1, 1 to 0) NOT A AND Output 1 only if all inputs are 1 A · B OR Output 1 if any input is 1 A + B NAND AND, then inverted (0 only if all 1s) N...
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