There are two basic principles when approaching Examinations and can be summed up by two simple acronyms.
RTFQ (Read The F***#@g Question)
KISS (Keep It Simple, Stupid)
Understand what the question asks, it's usually how well you can interpret English, and answer what is asked for. If the question is about pistons, don't talk about crankshafts.
Regard the Examiner as a first trip cadet or oiler. Do NOT assume he or she "knows what you mean". If you don't say it, it will be assumed that you don't know it and the question will be marked accordingly.
To illustrate, I was asked a question, 2EKG, to sketch and describe a coil ignition circuit for a gasoline motor. Well, I had a motorbike with a battery, primary coil, points, condenser, cam, secondary coils and spark plug. QED, a gift, full points for that question and it wasn't even mentioned in Orals.
Incidentally, I couldn't find that question about calculating crankshaft angles in the question bank. The questions are usually about operation, maintenance and repair, not design.
Discourage incest, ban country "music".