9620 · Oxford AQA International A Level
9620/11
Paper 1
Chemistry · 2023 · Variant 1
Relative difficulty
Analysis source: Oxford AQA
Analysis aligned to the official syllabus and assessment design.
3.8 / 5
360
445 min
Practical skills and synoptic experimental chemistry
Cohort performance
Session statistics from official examination reports
Total marks
360
Duration
445 min
Session difficulty
3.8 / 5
Key examiner messages
Top priorities from the principal examiner before you revise
The January 2023 Oxford AQA International A-Level Chemistry (9620) examination suite represents a balanced but highly rigorous assessment.
The overall difficulty is positioned at 4 stars (Difficulty Index 3.8/5).
While Unit 1 (CH01) and Unit 2 (CH02) present accessible starting points with standard AS physical and organic foundations, Units 3 and 4 escalate significantly in conceptual depth and mathematical load, notably in thermodynamics, multi-step buffer calculations, and complex organic mechanisms (such as electrophilic substitution and nucleophilic addition-elimination).
Unit 5 successfully synthesises practical methodology with multiple-choice synoptic coverage, demanding flawless recall of experimental nuances.
Question difficulty map
How candidates performed on each question in this series
No data available in official reports
Assessment objectives
Skill and AO weighting from official examiner commentary
Skill weighting
Shows the skill mix this paper tested most heavily.
Mathematical & Calculation
Weight: 9100%Mechanism & Structure
Weight: 889%Arrow
Weight: 778%Practical & Experimental
Weight: 667%Descriptive
Weight: 444%Inorg
Weight: 333%Structure &
Weight: 222%Bondi
Weight: 111%
Method marks watchlist
Where working, steps, or method marks were commonly lost
No data available in official reports
Recurring mistakes across years
Themes examiners flag in multiple recent sessions for this subject
No data available in official reports
Question choice intelligence
Mean scores and popularity for optional questions (HKDSE electives)
No data available in official reports
Level exemplars
What candidate scripts at each grade level looked like
No data available in official reports
Grade & admission context
How marks relate to grade thresholds and entry standards
Report type
Examiner report — national grade boundaries and question-level commentary
Level A*
Approx. 90% of maximum mark
Level A
Approx. 80% of maximum mark
Level B
Approx. 70% of maximum mark
Level C
Approx. 60% of maximum mark
Level D
Approx. 50% of maximum mark
Level E
Approx. 40% of maximum mark
Deep insights
What top candidates did
Techniques and approaches examiners rewarded in this series
No data available in official reports
Command word playbook
How to match each command word to the expected response style
Give reasons and link mechanism to outcome; each point needs a because/so chain.
Show formula, substitution, and unit; method marks need visible working.
Match the expected response style for “equation” questions.
Match the expected response style for “Draw” questions.
Name or point to the specific feature asked for — avoid extra explanation.
Match the expected response style for “State” questions.
Time traps
Sections where candidates spent disproportionate time relative to marks
Min per mark: 2
Min per mark: 1.5
Min per mark: 1.3
Syllabus traceability
Topics linked to questions and mark weighting in this session
Practical skills and synoptic applications
30 marks this session
Thermodynamics (Physical chemistry)
22 marks this session
Alcohols (Organic chemistry)
22 marks this session
Properties of Period 3 elements and their oxides and chlorides (Inorganic chemistry)
20 marks this session
Aldehydes and ketones (Organic chemistry)
17 marks this session
MCQ trap analytics
Commonly chosen wrong options from examiner commentary
No data available in official reports
Topic heatmap across years
Mark concentration by topic and exam year for this subject
Mark intensity
Amount of substance
Practical skills and synoptic applications
Acids and bases
Energetics
Rate equations (Physical chemistry)
Thermodynamics
Amount of substance (Physical chemistry)
Thermodynamics (Physical chemistry)
Difficulty trend
How session difficulty has shifted across recent years
Paper comparison
Marks and duration breakdown across papers in this session
Unit 1: Inorganic 1 and Physical 1: Unit 2: Organic 1 and Physical 1: Unit 3: Inorganic 2 and Physical 2: Unit 4: Organic 2 and Physical 2: Unit 5: Practical and synoptic:
Marks you can still earn
Where valid approaches outside the mark scheme may still gain credit
No data available in official reports
Practise what examiners flagged
Target weak topics from this report inside the Revui app
Practical skills and synoptic applications
30 marks this session
Practise in RevuiThermodynamics (Physical chemistry)
22 marks this session
Practise in RevuiAlcohols (Organic chemistry)
22 marks this session
Practise in RevuiProperties of Period 3 elements and their oxides and chlorides (Inorganic chemistry)
20 marks this session
Practise in RevuiAldehydes and ketones (Organic chemistry)
17 marks this session
Practise in RevuiSelf-diagnostic checklist
Key actions before you sit this paper — copy and tick off as you revise
- 1Message
The January 2023 Oxford AQA International A-Level Chemistry (9620) examination suite represents a balanced but highly rigorous assessment.
- 2Message
The overall difficulty is positioned at 4 stars (Difficulty Index 3.8/5).
- 3Message
While Unit 1 (CH01) and Unit 2 (CH02) present accessible starting points with standard AS physical and organic foundations, Units 3 and 4 escalate significantly in conceptual depth and mathematical load, notably in thermodynamics, multi-step buffer calculations, and complex organic mechanisms (such as electrophilic substitution and nucleophilic addition-elimination).
- 4Message
Unit 5 successfully synthesises practical methodology with multiple-choice synoptic coverage, demanding flawless recall of experimental nuances.
Teacher briefing pack
One-page session summary for tutors and classroom review
2023 2023
Chemistry
The January 2023 Oxford AQA International A-Level Chemistry (9620) examination suite represents a balanced but highly rigorous assessment. The overall difficulty is positioned at 4 stars (Difficulty Index 3.8/5). While Unit 1 (CH01) and Unit 2 (CH02) present accessible starting p
The January 2023 Oxford AQA International A-Level Chemistry (9620) examination suite represents a balanced but highly rigorous assessment.
The overall difficulty is positioned at 4 stars (Difficulty Index 3.8/5).
While Unit 1 (CH01) and Unit 2 (CH02) present accessible starting points with standard AS physical and organic foundations, Units 3 and 4 escalate significantly in conceptual depth and mathematical load, notably in thermodynamics, multi-step buffer calculations, and complex organic mechanisms (such as electrophilic substitution and nucleophilic addition-elimination).
- Total marks
- 360
- Duration
- 445 min
- Session difficulty
- 3.8 / 5
Session analysis
The January 2023 Oxford AQA International A-Level Chemistry (9620) examination suite represents a balanced but highly rigorous assessment. The overall difficulty is positioned at 4 stars (Difficulty Index 3.8/5). While Unit 1 (CH01) and Unit 2 (CH02) present accessible starting points with standard AS physical and organic foundations, Units 3 and 4 escalate significantly in conceptual depth and mathematical load, notably in thermodynamics, multi-step buffer calculations, and complex organic mechanisms (such as electrophilic substitution and nucleophilic addition-elimination). Unit 5 successfully synthesises practical methodology with multiple-choice synoptic coverage, demanding flawless recall of experimental nuances.
Updated Jun 12, 2026
Paper breakdown
Unit 1: Inorganic 1 and Physical 1: Unit 2: Organic 1 and Physical 1: Unit 3: Inorganic 2 and Physical 2: Unit 4: Organic 2 and Physical 2: Unit 5: Practical and synoptic:
Top chapters
Exam structure insights
Marks by chapter
See where the marks were concentrated so revision time goes to the highest-value topics.
Mark accessibility
Estimate which marks were basic, mid-level, or high-difficulty.
75% within easy or medium reach
Command word frequency
Spot common command words so answers match the expected response style.
Question type mix
Compare the mark share of each paper section and question type.
Structured
330·29·92%
Multiple Choice
30·30·8%
Study ROI
Bigger bubbles recur more often; higher bubbles carry more marks, helping you rank revision priorities.
Time vs marks
Compare marks with suggested time allocation to plan exam pacing.
Unit 1: Physical an
0.50 m/minUnit 5: Section A (
0.67 m/minUnit 5: Section B (
0.75 m/minTotal marks
80
Total time
125 min
Avg pace
0.64
Next-year prediction
Topics worth watching next year, with the reason shown directly below each bar.
Equilibrium Constant Kp
85%85%
Advanced NMR Spectroscopy
80%80%
Executive Difficulty Verdict
The January 2023 Oxford AQA International A-Level Chemistry (9620) examination suite represents a balanced but highly rigorous assessment. The overall difficulty is positioned at 4 stars (Difficulty Index 3.8/5). While Unit 1 (CH01) and Unit 2 (CH02) present accessible starting points with standard AS physical and organic foundations, Units 3 and 4 escalate significantly in conceptual depth and mathematical load, notably in thermodynamics, multi-step buffer calculations, and complex organic mechanisms (such as electrophilic substitution and nucleophilic addition-elimination). Unit 5 successfully synthesises practical methodology with multiple-choice synoptic coverage, demanding flawless recall of experimental nuances.
Examiner notes & key calculations
- The 'it' pitfall: Many students lose communication marks by using vague pronouns. Be explicit: write 'the barium ion' rather than 'it'.
- Arrow precision: Ensure curly arrows originate precisely from a lone pair or a covalent bond and end exactly on the target atom. Incorrect arrow placement in the nucleophilic addition-elimination mechanism of acyl chlorides remains a top mark-loser.
- Graph drawing: In thermometric titrations, drawing separate lines of best fit that ignore the transition points is essential for a precise temperature-rise extrapolation. Don't simply connect the dots.
Analysis is paraphrased for study purposes. Always verify against the official examiner report and mark scheme.