Some memorisation is unavoidable, but it is the floor, not the ceiling. A process certification exam expects a body of terms and rules to be held in memory, then tests whether you can judge when and how to use them — and it is the judgement that carries the paper.
This is the question that decides how a candidate should spend the last weeks before a paper, so it is worth drawing the line between what genuinely must be memorised and what cannot be.
What a process certification exam still asks you to memorise
There is a base layer no amount of judgement replaces. You have to know the vocabulary a framework uses, the phases of a method and their order, the roles and their responsibilities, the meaning of an index or a chart. If you cannot recall that a RACI chart names exactly one accountable party for each task, you cannot begin to reason about an item that turns on it. Memorisation earns you the right to attempt the question; it rarely earns you the answer.
Where judgement takes over in a project management exam
Past that layer, the paper turns to application, and memory stops helping. An ISTQB item may expect you to know what equivalence partitioning is, then hand you a specification and ask which partitions it yields and which single value represents each — or give you a decision table and ask which rule a described combination of inputs triggers. You cannot memorise the answer, because it lives in the specific specification in front of you. The recalled definition is the tool; selecting and applying it is the exam. That balance — a little memory, a great deal of judgement — holds across the vertical.