In the last few days, you should:
(i) only revise material you know and understand fairly well. This keeps Information fresh and gives you confidence.
(ii) revise using your notes. If you feel you must look at the textbook, then only revise the introduction (a broad overview of the topic) and the conclusion (often contains a summary of the information) to each chapter.
(iii) practise jotting down outlines or plans for answers to questions.
(iv) practise writing out one or two answers in full against the clock. (Be sensible here).