Easy!
I got an A grade at AS with my A grade coursework.
Honestly everybody in the class did their revision notes, reading the book and all messed up.
Best thing to do is learn the question and the answer, go through every past paper on the AQA website until you know every answer of by heart so when you sit down and do it you rinse it in 30 mins flat and know every answer.
If that doesnt work, disect the past papers and you will see there are similar questions asked every year, just find the correct answers for them and learn them off by heart and your looking at 80% right on the exam.
Any problems or queries ask me.
Good Luck!