Find out from your teacher what will be examined and focus your revision on these topics
Have all your notes in these subjects organised and revised from the beginning of the year building on what you did with them in Year 9
Throughout the year keep the organisation of your notes going so that in November you are ready
There are past papers - make use of them by having a go at the questions. Sometimes this will be done in class for you.
Listen to your teacher's advice about how to approach certain questions and what to do and what not to do - they DO know what they are talking about
Have a look at the Board of Studies Web Site for information regarding the exams