Exams are no great problem if you approach them from the right angle.
When told to turn over the paper, read all the questions before doing any thing, then go to those that you are sure that you know the answers to.This means you will not waste time on the questions that you are unsure of .
As regards revising, do whatever suits you, you may be the sort of person that has accumulated enough knowledge over the years and feel that cramming is an unecessary evil but for those that have a shorter memory or a photgraphic one then this may be the answer.
Whatever happens they are not the be all and end all, there is also the school of life that can teach us more than we will ever learn via a blackboard .
At the end of the day, each one of us is important and academic qualifications although looking good on a CV are not always best suited to each individual.
To those that have exams to sit in the next few weeks. good luck, good judgement and GO on surprise yourselves at what you have mastered.
I took my last ones a few years ago and I am old enough to be a grandparent to those that are sitting them now.
Life is a learning process and it can teach us more than was ever written between the pages of a book.