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Every syllabus topic explained in plain language, with definitions, examples and the mistakes examiners see most.

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Notes follow the order of your course, so you can find a topic in seconds.

Why enzymes denature

High temperatures break the bonds holding an enzyme in shape. Its active site changes shape, so the substrate no longer fits.

Common mistake: enzymes are not killed, because they were never alive.

Built for recall

Definitions, common mistakes and recall questions sit next to each explanation.

Term

Opportunity cost

The next best alternative given up when making a choice.

Practise straight after reading

Every page links to questions and flashcards for the same topic.

  • Question 4
  • Physics
  • SL
  • Paper 1

A ball is thrown straight up and air resistance is negligible. Which statement is correct?

  • AKinetic energy stays constant all the way up
  • BAcceleration is zero at the highest point
  • CVelocity is zero at the highest point Correct
  • DThe resultant force acts upwards
  • Plain language

    Explanations use short sentences and worked examples, not walls of text.

  • Exam focused

    Command terms and mark scheme language are pointed out where they matter.

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in syllabus order
Every topic
content marked clearly
SL and HL
to questions and flashcards
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