how do u revise?Watch
In most courses that Blair and his ilk haven’t interfered in the exams count for much, sometimes all, of the grade.
To succeed in an exam you must have the information you need stored in your subconscious memory. The more you re-read or re-learn something, the more the neurons in the brain are shaped and connected to remember it.
So, first understand the material, and then program your subconscious mind to record the material by repeatedly thinking or learning about it, particularly model exam essays where possible.