Common Mistakes in IB ESS Exams

Every year, IB ESS students lose marks for the same avoidable mistakes. Understanding these common errors before your exam can immediately improve your score.

Not reading the command term

The command term tells you exactly what the examiner expects. Writing an explanation when the question says "state" wastes time. Writing a description when asked to "evaluate" loses marks.

Always circle the command term before answering. See real ESS examples for each command term or browse the full list of all 23 IB command terms.

Writing without structure

Long, unstructured paragraphs make it hard for examiners to find your key points. Use clear paragraphs with one main idea each. For higher-mark questions, use a brief introduction and conclusion.

Ignoring real-world examples

ESS questions often reward specific examples. Instead of writing "pollution affects ecosystems", write "oil spills such as the Deepwater Horizon disaster in 2010 caused significant damage to marine ecosystems in the Gulf of Mexico."

Specific examples demonstrate deeper understanding and earn more marks.

The best way to spot your own mistakes is to practise with real exam questions and get instant AI feedback on your answers.

Weak evaluation

For questions asking you to evaluate or discuss, many students only present one side. Top answers include:

• Arguments for and against
• Strengths and limitations
• A clear conclusion that weighs the evidence

Poor time management

Spending 15 minutes on a 2-mark question means you will run out of time for the 9-mark essay. Follow the 2-minutes-per-mark rule and move on if you are stuck.

How to avoid these mistakes

• Practice under timed conditions
• Review mark schemes to understand what examiners reward
• Use the ESS question bank to identify your weakest areas

For more exam strategies, see our guides on How to Answer 6-Mark Questions and How IB ESS Exams Are Marked.