Most lost marks are not lost to ignorance, they are lost to answering a slightly different question. The verb in the question tells you what shape the answer has to be.
Describe, explain, compare, evaluate and justify are not synonyms, and an examiner marking an explain question has a list in front of them that awards marks for reasons. A perfect description scores badly against it, not because it is wrong, but because it is a different task.
So the first thing to do with any question is underline the verb, and the second is to note the mark count. Six marks almost never means one long paragraph. It usually means three points, each developed.
Then check for the quiet constraints. A question that says with reference to the graph is telling you that answers not referring to the graph will not score. A question that says in your own words is telling you that a quoted definition will not.
None of this requires knowing more content. It is thirty seconds of reading that regularly moves an answer up a grade boundary, which makes it the cheapest revision available.
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Reading about a topic and understanding it are different things. The Concept Clinic is one session on one topic.
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