Your exam will be held on Thursday 25th November, so you should be well prepared by now. For some last minute revision you may like to use the Biology Q and A site, which has hundreds of exam-style questions in different categories. The most relevant for Unit 2 are as follows:
Ecology (sections 1 to 9)
Remember to read the questions carefully and don’t be fooled by any furphies thrown in to trick you. Make sure you sleep and eat well this week, prior to your exams and try to relax.