I was in the same position as you a year ago today. I had gotten a D at AS so was retaking in A2 year. I knew absolutely nothing and had about 5 days to get my **** together. Ended up getting 94/100ums on the paper!
My advice?
Don't focus on going in depth on the knowledge from now on as you don't have time. Just focus on structure. Honestly it works wonders! I can't remember exactly what the structure was like, but I'm pretty sure that for every point you make or every key theme there is in the topic you just need to be able to explain it in one concise sentence; learn an example; learn to explain that example; learn a counter argument/alternate view for that point; learn to explain it; and learn a strong argument i.e. no sitting on the fence. By learn I just mean memorise for the exam so you don't waste time.
Remember the examiner skims over our work quite quickly so you don't need to be fancy, just make sure your sentences are jam packed with *key terms* from the textbook and make sure you follow that very simple structure. Don't freak out about knowing everything - only focus on the examples that have relevance across the board
I did this and got almost full marks whereas my friend who was very passionate about the subject and claimed to know the information back to front got a C in the same exam. It's unfair but that's just how it works.
I think the most important thing is key terms and logical structure.