Aoa..I wanted to ask the old and the experienced ones over here to tell me that how many times it is enough to do the past papers? Im taking Physics, Chemistry, Biology and Maths (A2). Those who are done with the past papers please tell me that if I do papers sincerely, that is time them and everything, how many times would it take before im able to remember and get familiar with the questions and especially those tricky questions that need to be done again and again??