So do attempt all five requested questions. Even writing short notes on the question should get you something. You only need to know five KEY facts to write a good answer. Learn 5 key facts on all the major topics in your subject. Don't learn too much.
Trivia are interesting but often irrelevant.
Putting in trivia will often exasperate the examiner. Just writing down the fact is usually not enough. You have to give a short explanation why this fact is important and relevant to the question. There is a tendency to wander away from the specific question. Every now and then re-read the question to make sure that your answer is not wandering away from the question.