What Mistakes Do Younger MYP Science Students Make?

The biggest one: describing instead of explaining. Younger MYP students write what happened in an experiment but never say why, so they miss the higher achievement levels in Criterion C. Other regulars are skipping units, vague variables, and copying method steps from a worksheet without adapting them to their own investigation.

Most mark loss comes from mismatching the command term to the response. If a task says "explain", a list of facts scores low even if every fact is correct — the criterion descriptors reward reasoning, not recall. Students also lose marks by ignoring the exact strand wording in the task-specific clarification.

Weak hypotheses. Students often write "I think X will happen" with no scientific reasoning attached. A proper MYP hypothesis links a variable to an outcome and explains the reasoning using a science concept — that reasoning is exactly what Criterion B rewards.

"Explain" means give reasons or causes — not just describe what happens. "Evaluate" means weigh up strengths and weaknesses and reach a judgement, not simply list them. Confusing these two command terms is probably the single most common reason younger students plateau at mid-level marks.

Each criterion tests a different skill, and mixing them up is a common mistake. Criterion A checks scientific knowledge and application, B checks your inquiry design, C checks data processing and evaluation, and D checks understanding of science's impact on society and the environment.

Start by reading the task-specific clarifications before you write anything — they tell you exactly what each level needs. Then check your draft against the command term used. In fifteen years of marking this age group, the students who improve fastest are the ones who self-check against the criterion wording before handing work in.

Structure it around the criteria, not around what you did in the lab. Start with a testable hypothesis with reasoning, list controlled variables clearly, and describe a method detailed enough that a classmate could repeat it exactly. Then process your data and evaluate its reliability, not just describe the trend.

Don't just reread your notes — practise applying command terms to unfamiliar contexts, since that's what tests actually assess. Work through past topical questions, then mark your own answers against the criterion descriptors rather than just checking if the "facts" were right.

The most useful thing you can do isn't reteaching content — it's asking your child to explain their reasoning out loud. Ask "why do you think that happened?" after homework, since that's exactly the skill Criterion C and D reward, and it's the one students skip when working alone.

Yes, especially in Year 7 or 8 — MYP achievement levels run 0-8 per criterion, and most students start in the low-to-mid range while they learn what each criterion actually demands. A level 4-5 in early MYP is not a red flag on its own; a flat level across a whole year without movement is worth raising with the teacher.

Look for resources organised by criterion and command term, not just by topic, since that's where most marks are actually lost. Revision Notes that explain what each command term requires, paired with practice questions marked against the real criteria, help students self-correct before a test rather than after it.