Question 1

How do I know if I've properly learned a topic in Chemistry?

Accepted Answer

A reliable sign that you've properly learned a topic is whether you can recall and explain it from memory without looking at your notes. Our quizzes use active recall to test exactly this: if you can answer questions cold and explain your reasoning, that's a much stronger signal than feeling comfortable re-reading a page.

For Cambridge IGCSE Chemistry (0620), it's worth remembering that the exam tests more than knowledge recall alone. AO2 (handling information and problem-solving) makes up 30% of the qualification, meaning you'll face questions that apply familiar ideas to unfamiliar scenarios. We'd suggest also working through our exam practice questions on a topic to check you can apply what you know, not just recognise it from a list of options.

Question 2

How often should I quiz myself when revising IGCSE Chemistry?

Accepted Answer

The research on spaced retrieval gives a clear steer here: quizzing yourself regularly across several shorter sessions, rather than cramming into one long block, leads to much stronger memory retention over time. For IGCSE Chemistry, which covers 12 topics from states of matter through to experimental techniques and chemical analysis, returning to each area every few days helps keep the knowledge fresh and lets you spot gaps before they become exam problems.

Our quizzes are organised by topic, so we'd suggest working through each area in turn and coming back more frequently to any topics where your score is lower. As your exams approach, increasing the frequency of quizzing across all 12 topics builds the fluency you need for Paper 2's multiple-choice questions and the short-answer work in Paper 4.

Question 3

Should I do a quiz before or after reading the notes?

Accepted Answer

Trying the quiz before reading the notes is a great place to start. Pre-testing primes your brain to notice the right details when you work through the notes, so the content sticks more readily.

We'd suggest having a go at our quizzes first, then reading through our notes on the same topic, and then returning to the quiz to check what has stuck. That second pass shows you exactly where your Cambridge IGCSE Chemistry knowledge is solid and where you need a bit more time.

Question 4

What's the difference between Cognito's quizzes and the actual exam questions?

Accepted Answer

Our quizzes are designed for active recall and spaced retrieval practice, prompting you to retrieve one concept at a time to help the content stick between revision sessions.

The actual Cambridge IGCSE Chemistry Extended papers are structured quite differently: Paper 2 presents 40 four-option multiple-choice questions to answer in 45 minutes, while Paper 4 asks for short-answer and structured written responses across 80 marks in 1 hour 15 minutes. Our quizzes won't replicate the longer structured-question format of Paper 4, where you'll need to build written explanations in prose and apply your knowledge to unfamiliar contexts.

The content our quizzes cover is exactly what both papers are testing, so we'd suggest using them regularly to consolidate your recall first, then moving to past-paper practice to get comfortable with how Cambridge phrases and formats its questions.