No one can tell you these things as they're very personal to you. You have to work them out for yourself. Start with thinking about what you're struggling with in terms of your exams. Are you reading and understanding the question? Do you lack factual knowledge or are you struggling with essay type questions? In terms of managing your time, start early, make a study plan and stick with it. Go over the material again and again till you know it well and make sure you understand everything. Maybe sit with the syllabus and work out what you know and don't. Do some timed mock tests by yourself for practise,