Once this exercise has been done, correct your paper and note the errors you have made. The information you glean from this exercise can be used to orient your study before tackling another exam paper. The answers to the above questions offer valuable feedback and can be used for your benefit. Some people say that 'practice makes perfect' but this saying is not always 'true'. A better saying in my view is 'effective practice leads to improvement'.
Effective practice draws on the feedback gained from past mistakes.
The time you spend preparing for exams must be lengthy and, in addition, organised to simulate the conditions of an impending exam. If you follow the steps outlined above then you will be better prepared to handle the stresses of study and exam taking. Good luck in your endeavours.