Go through each and every past paper that you have done for section 1 and 2. Identify any trends in the mistakes you have made, or for that matter particular areas in section 2 which you found difficult. Find solutions to all questions you answered incorrectly and revise difficult topics for section 2 using the assumed knowledge guide. Try and use a technique when answering questions e.g. for section 1 read the question the read the passage and then eliminate any answers which aren't suitable given what the question asks. For section 2, identify the knowledge you need for the question and select what is relevant from whatever information is given. Then apply your knowledge to the question accordingly. Hope this helps in some way.