Im studying Mod 2 with bristol at the moment to sit my exams in May. Both modules will have probably taken me about 6 months each.
Don't worry too much about reading endless past papers, you'll get to do plenty of that later. Alex and the gang have been doing this for years and you will be brought right up to date at your brush up.
Spend all your time learning the subjects and get all the principles and theory into your head. The shortcuts and points to note will be shown to you later.