How to prepare examination

Examination for what?
Your questions have absolutely no details in them.

If your doing a test you need not to 'cram' because that NEVER works unless you have a photograph memory. You should have been studying days ago for this test you are expected to perform. Anyway if you have time left reads a few pages at a time each day just don't try read everything and remember it once.

Also you should make flashcards and quizzes yourself the ones you fails on that is where u need to study. That is what I was taguht in school by the IEP people.

What is the learning disability involved? What sort of examination are you (or whoever) preparing for? How old are you (or whoever) and any other details you can give us.

Just make sure you have cleanknickers on.