Doing the past papers would help right now since there's not much time left. Mark your wrong questions and a day or 2 before the exam revise them so that you know where you've made mistakes. For MCQ time management will the most important right now since that's what most people struggle with. Give a minute for easy questions and if you think its hard, mark it and come back to it later. This should help you get a B at least if your subject knowledge is average. If its better you may even get an A. Good luck!