Hi Mal,
As a general comment, doing exams you should always
- read through the whole thing first. This is most important.
- allocate time according to the marks on each Q. Don't spend too long on any question.
- do the easiest ones first, the questions you feel are a gimme. This will give you confidence.
- then reallocate the time left. You should allow a little time for review at the end.
Now with multiple choice, the examiner will include choices which are referred to as "distractors". These are choices which are attractive but wrong. They will be close, but not quite correct.
Read the question part carefully and literally. If you know the material well, the correct answer should then leap out at you.
If unsure,
you have to choose the most logical looking answer.
As with tennis, the best runup is practice. Try to get some old exams of this type and practice on them. You will get the idea then.
Cheers