Skip to content
IGCSE Chemistry: Cambridge 0620 tutoring, Malaysia

Exam Time Management: Papers 1 and 3 (Core)

How to pace IGCSE Chemistry 0620 Core papers: per-question timing for Paper 1 (40 questions in 45 minutes) and section pacing for Paper 3 (80 marks in 75 minutes).

Published by IGCSEChemistry.com.my

Chemistry teaching team: K. S. Tan (15+ years teaching IGCSE Chemistry) and Ms Yash (10+ years teaching IGCSE Chemistry) and Ms Kartini (15+ years teaching IGCSE Chemistry).

Mapped to Cambridge IGCSE Chemistry 0620 (2026–2028). Last updated 2026-08-24.

Core candidates sit two written papers: Paper 1 (multiple choice) and Paper 3 (structured theory), plus a practical component. They fail different candidates in different ways. Paper 1 punishes the student who lingers; Paper 3 punishes the student who over-writes. This guide gives the pacing arithmetic for both. If you are unsure which papers you sit, check which paper am I taking first.

Paper 1: the arithmetic

Paper 1 is 40 questions in 45 minutes, one mark each, no partial credit, no negative marking.

  • 45 minutes ÷ 40 questions = 67.5 seconds per question
  • factual questions (definitions, properties, observations): 20-40 seconds
  • data-interpretation and calculation questions: 60-90 seconds
  • aim to finish with 3-5 minutes to spare for review

The pace only works if your Core facts are at instant recall. Thirty seconds spent recalling the colour of copper(II) hydroxide is thirty seconds stolen from a later question. Build that recall with flashcards before the exam, not in the hall.

The three-pass approach for Paper 1

First pass (about 30 minutes). Work through questions 1-40 in order. Answer everything you can settle within 60 seconds. For anything harder, eliminate the wrong options, record your best guess, circle the number and move on. Leave no blank on the first pass — if time runs out later, every question still has an answer.

Second pass (about 10 minutes). Return to the circled questions. Re-read each stem for a missed word such as “not” or “least”. Change an answer only for a specific reason, never because it “feels wrong”.

Third pass (about 5 minutes). Scan the answer sheet: every question answered, each mark on the intended row, and one or two calculations re-checked.

The Paper 1 time traps

  • The question you “almost know”. If it will not come within 30 seconds, guess and move on. One mark is not worth two minutes.
  • The double negative. “Which statement is not incorrect” is deliberately confusing. Underline the negatives and work option by option, but cap it at about 90 seconds.
  • Multi-step arithmetic in your head. Write the working on the paper; you are allowed to. A single written line prevents most power-of-ten and ratio slips.

Paper 3: the arithmetic

Paper 3 is 80 marks in 1 hour 15 minutes of structured theory, no negative marking.

  • 75 minutes ÷ 80 marks = about 56 seconds per mark
  • a one-mark “state” answer should take far less; a four-mark calculation, more
  • reserve the final 5-8 minutes for blanks, units, equations and graph readings

The mark allocation, not the clock, sizes each answer. A two-mark question wants two creditable points and then you move on; polishing it into a paragraph spends a later question’s time.

Section pacing for Paper 3

Paper 3 is a booklet of structured questions of rising demand. A workable split of the 75 minutes:

PhaseTimeWhat you are doing
Early questionsfirst ~25 minShorter recall and one-step items. Bank these marks quickly and do not dawdle
Middle questionsnext ~30 minMulti-part questions, calculations, descriptions. Show working; match points to marks
Later questionsnext ~12 minThe most demanding parts and any longer explanations. Attempt every part even if unsure
Reviewfinal ~8 minFill blank lines, check units and equations, re-read one or two calculations

Two rules keep this on track:

  1. Never leave an answer line blank on the first pass. An attempted deduction can score; a blank cannot.
  2. Flag and move. If a subpart stalls you for more than about 90 seconds, mark it and continue. A single stubborn calculation must not cost you three later marks.

The Paper 3 over-writing trap

The most common Paper 3 timing failure is not slowness on hard questions; it is writing a full paragraph for a one- or two-mark item. Count the marks, give that many distinct points, and stop. The extra sentences earn nothing and quietly consume the minutes the later questions need.

Practising the pace

Do at least four or five full timed sets of each paper before the exam. After each one:

  1. Note your finishing time. Finishing Paper 1 in 35 minutes means you can afford more care; running past 45 means a question type is too slow.
  2. Record where time was lost on Paper 3: one hard calculation, or over-writing throughout? The two need different fixes.
  3. Classify the errors, not just the total, using the method in common exam mistakes.

The Core and Extended papers share timing arithmetic, so the Paper 2 timing guide and Paper 4 timing guide use the same structures if a route change is on the table.

Next steps

Pair this with the Paper 1 multiple-choice (Core) guide and the Paper 3 theory (Core) guide for answer technique, use the free diagnostic to find weak topics, and run timed sets from the topical questions and practice hub.

Frequently asked questions

How much time do I have per question on Paper 1?

Paper 1 is 45 minutes for 40 questions, about 67 seconds per question. Most factual questions take 20-40 seconds; calculation and data questions take 60-90 seconds. The pace works only if you do not get stuck on any single question.

How should I pace Paper 3?

Paper 3 is 80 marks in 75 minutes, roughly 56 seconds per mark. Use the mark allocation, not the clock, to size each answer, and reserve about 5-8 minutes at the end to fill blanks and check units and equations.

Do Papers 1 and 3 have negative marking?

No. Neither Core paper penalises a wrong answer, so every question and every answer line should have a response before you leave the hall.

Get an experienced Chemistry specialist on your side

Every new student starts with a 1-hour trial lesson taught by their assigned specialist, not a sales call. You'll know within the hour whether it's the right fit, and you are never asked for more than that hour. No forms. Book on WhatsApp and we reply the same day.