Question 1

How do I get full marks on a 6-mark question in Cambridge International (CIE / Cambridge Assessment International Education) IGCSE Chemistry?

Accepted Answer

Six-mark questions in CIE IGCSE Chemistry Paper 4 reward both the breadth of your points and the quality of your chemical reasoning, so a structured, precise response is what markers are looking for.

We'd suggest reading the command word carefully before you begin: CIE publishes exact definitions for command words in the syllabus, and knowing whether you're being asked to "describe", "explain" or "evaluate" shapes what your answer needs to include.

For longer structured questions, markers often apply levels-of-response marking, assessing the overall quality of your reasoning against a set of descriptors, which means several distinct, well-linked points will score more highly than one idea repeated in different ways.

Precise chemical terminology matters throughout, since AO1 (knowledge with understanding) accounts for 50% of the qualification and markers expect the language of the spec rather than vague everyday phrasing. Our exam practice questions include mark-scheme style guidance to help you see what a full-mark response looks like and where marks are typically awarded.

Question 2

What do the levels in the Cambridge International (CIE / Cambridge Assessment International Education) IGCSE Chemistry mark scheme mean?

Accepted Answer

Cambridge IGCSE Chemistry (0620) Paper 4 uses short-answer and structured questions, where marks are typically awarded for specific correct points rather than through a levels-based rubric of the kind used in essay subjects. The questions are designed around three assessment objectives: AO1 (knowledge with understanding, 50% of the qualification), AO2 (handling information and problem-solving, 30%), and AO3 (experimental skills and investigations, 20%), so a question testing calculation or data interpretation draws on different criteria than one testing recall.

Our exam practice questions include worked answers that show exactly which points earn credit, which is the clearest way to see how Cambridge examiners apply the mark scheme in practice. We'd suggest working through a few questions on a topic you've just revised and comparing your answers carefully against the mark scheme wording to build a feel for the precision Cambridge expects.

Question 3

What's the difference between Cognito's exam practice and past papers?

Accepted Answer

Our exam practice sorts questions by topic, so you can focus on whichever areas of the Chemistry syllabus you find most challenging, whether it's stoichiometry, organic chemistry or electrochemistry. Past papers present questions from across the whole specification in the sequence you'll encounter in the real exam. Both serve different purposes: our by-topic view works well in the earlier stages of revision when you want to build confidence in specific chapters, while full past papers from CIE help you practise working through Paper 2 and Paper 4 in one sitting. We'd suggest using our exam practice first to strengthen individual topics, then moving to complete past papers as your exams draw closer.

Question 4

How long should I spend on each question in the exam?

Accepted Answer

Pacing by marks is the most reliable approach, since the mark allocation for each question signals roughly how much time to give it. Here's how that works out across your three Extended papers:

| Paper | Time | Marks | Pace |
|---|---|---|---|
| Paper 2: Multiple Choice | 45 min | 40 marks | ~1 minute per question |
| Paper 4: Theory | 1 hr 15 min | 80 marks | ~1 minute per mark |
| Paper 5: Practical Test | 1 hr 15 min | 40 marks | ~2 minutes per mark |
| Paper 6: Alternative to Practical | 1 hr | 40 marks | ~1.5 minutes per mark |

On Paper 4, keeping close to one minute per mark is especially important, as it stops you overrunning on a longer structured question and leaving shorter ones unanswered. Our exam practice questions are a great way to build a feel for this rhythm before the real thing.