Well, know EVERYTHING inside out, make your weak points your strong ones, don't neglect any area, practice making your answers short (not too short!) but rather concise and specific (USE THE WORD "SPECIFIC"). Do as many exam style questions with practice exams and checkpoints, know key definitions by heart, summarise well, clarify ANYTHING you don't understand or seems grey rather than clear black and white. Try to teach someone/something (a teddy bear even!) everything you've learnt so far, this is the most effective revision technique known to mankind

Bio is a really hard subject, let's be honest, but luckily, it's easy. What the hell is he talking about? Bio is hard to answer every question you may be presented with accurately to grab all those marks to get A+. However the concepts are actually quite easy if you understand them, it's all in application of biology, after you have the knowledge you need.