ENVIRONMENTAL-SYSTEMS-AND-SOCIETIES · IB Diploma Programme
ENVIRONMENTAL-SYSTEMS-AND-SOCIETIES/11
(Case Study)
Environmental Systems and Societies · June 2023 · Variant 1
Relative difficulty
Analysis source: International Baccalaureate Organization
Analysis aligned to the official syllabus and assessment design.
3.0 / 5
65
120 min
Atmospheric systems, climate change feedback loops, and resource mitigation strategies.
Cohort performance
Session statistics from official examination reports
Total marks
65
Duration
120 min
Session difficulty
3.0 / 5
Key examiner messages
Top priorities from the principal examiner before you revise
In Section A, high-scoring candidates secured quick, easy marks on direct graph-reading tasks (such as identifying coral-reef vulnerability and reading ozone levels).
However, the real differentiator lay in the short-explanation questions (e.g., explaining positive feedback loops of deforestation or evaluating reforestation as a climate mitigation strategy).
In Section B, students who consistently defined key terms (like GPP, NPP, MSY) in their 4-mark and 7-mark openers, and systematically organized their 9-mark responses with a clear introduction, comparative arguments, and an evaluative conclusion, easily reached the top mark bands (7–9 marks).
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.
Analysis & R
Weight: 6100%Systemic/
Weight: 583%Feedback
Weight: 467%Syllabus
Weight: 350%Knowledg
Weight: 233%Evaluation & Analysis
Weight: 117%
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
IB subject report — grade distributions, IA weighting, and HL/SL distinctions
Level 7
Excellent — top band for competitive university offers
Level 6
Very good — strong HL performance
Level 5
Good — solid pass at higher level
Level 4
Satisfactory — minimum for many university credits
Level 3
Mediocre
Level 2
Poor
Level 1
Very poor
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
Match the expected response style for “Outline” questions.
State features in sequence or list observable properties — do not explain causes unless asked.
Match the expected response style for “State” questions.
Match the expected response style for “extent” questions.
Name or point to the specific feature asked for — avoid extra explanation.
Give reasons and link mechanism to outcome; each point needs a because/so chain.
Support your choice with specific evidence from data or the scenario given.
Match the expected response style for “contrast” questions.
Time traps
Sections where candidates spent disproportionate time relative to marks
Min per mark: 1.8
Min per mark: 1.8
Min per mark: 0
Syllabus traceability
Topics linked to questions and mark weighting in this session
Atmosphere and climate change
19 marks this session
Water
13 marks this session
Ecology
11 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
Ecology
Atmosphere and climate change
Foundation - Perspectives, Systems, Sustainability (Syllabus content)
18.5 marksNatural resources (Syllabus content)
Biodiversity and conservation
Human populations and urban systems
Water
Difficulty trend
How session difficulty has shifted across recent years
Paper comparison
Marks and duration breakdown across papers in this session
Paper 2 (Standard Level):
Marks you can still earn
Where valid approaches outside the mark scheme may still gain credit
- Believing that HFCs (Hydrofluorocarbons) are major ozone-depleting substances, whereas they are greenhouse gases developed as safer alternatives for the ozone layer.
Practise what examiners flagged
Target weak topics from this report inside the Revui app
Atmosphere and climate change
19 marks this session
Practise in RevuiWater
13 marks this session
Practise in RevuiEcology
11 marks this session
Practise in RevuiSelf-diagnostic checklist
Key actions before you sit this paper — copy and tick off as you revise
- 1Message
In Section A, high-scoring candidates secured quick, easy marks on direct graph-reading tasks (such as identifying coral-reef vulnerability and reading ozone levels).
- 2Message
However, the real differentiator lay in the short-explanation questions (e.g., explaining positive feedback loops of deforestation or evaluating reforestation as a climate mitigation strategy).
- 3Message
In Section B, students who consistently defined key terms (like GPP, NPP, MSY) in their 4-mark and 7-mark openers, and systematically organized their 9-mark responses with a clear introduction, comparative arguments, and an evaluative conclusion, easily reached the top mark bands (7–9 marks).
Teacher briefing pack
One-page session summary for tutors and classroom review
June 2023 2023
Environmental Systems and Societies
In Section A, high-scoring candidates secured quick, easy marks on direct graph-reading tasks (such as identifying coral-reef vulnerability and reading ozone levels). However, the real differentiator lay in the short-explanation questions (e.g., explaining positive feedback loops
In Section A, high-scoring candidates secured quick, easy marks on direct graph-reading tasks (such as identifying coral-reef vulnerability and reading ozone levels).
However, the real differentiator lay in the short-explanation questions (e.g., explaining positive feedback loops of deforestation or evaluating reforestation as a climate mitigation strategy).
In Section B, students who consistently defined key terms (like GPP, NPP, MSY) in their 4-mark and 7-mark openers, and systematically organized their 9-mark responses with a clear introduction, comparative arguments, and an evaluative conclusion, easily reached the top mark bands (7–9 marks).
- Total marks
- 65
- Duration
- 120 min
- Session difficulty
- 3.0 / 5
Session analysis
In Section A, high-scoring candidates secured quick, easy marks on direct graph-reading tasks (such as identifying coral-reef vulnerability and reading ozone levels). However, the real differentiator lay in the short-explanation questions (e.g., explaining positive feedback loops of deforestation or evaluating reforestation as a climate mitigation strategy). In Section B, students who consistently defined key terms (like GPP, NPP, MSY) in their 4-mark and 7-mark openers, and systematically organized their 9-mark responses with a clear introduction, comparative arguments, and an evaluative conclusion, easily reached the top mark bands (7–9 marks).
Updated Jun 14, 2026
Paper breakdown
Paper 2 (Standard Level):
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.
72% 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 Essay
(Section B choice)
40·6·62%
Short Answer / Data Response
25·14·38%
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.
Section B (Question
0.57 m/minSection B (Question
0.57 m/minPlanning & Review
0.00 m/minTotal marks
40
Total time
75 min
Avg pace
0.53
Cumulative marks ladder
The line is your running mark total question by question; dashed lines are the estimated grade cut-offs. See which question the line crosses your target grade at, so you know how far you must answer cleanly and which questions decide a band.
Next-year prediction
Topics worth watching next year, with the reason shown directly below each bar.
Eutrophication and aquatic food systems
5%5%
Acid deposition and regional impacts
4%4%
Solid Domestic Waste management options
4%4%
Exam tips
Paper format
- Duration
- 1h
- Total marks
- 35
- Weighting
- 35%
- Question types
- Data interpretation & Calculations, Short Outline / Suggestion / Explanation, Extended Evaluation, Synthesised Discussion Essay
Analysis is paraphrased for study purposes. Always verify against the official examiner report and mark scheme.