exam time

I've got my geography exam in around 2 weeks and I've done barely any revision. It's a humanities subject and then I've got another humanities the next day and sciences later which I'm also not prepared for. Is this enough time to achieve an A. Although I shouldn't compare, GCSE's I did barely any revision and managed to do quite well. I honestly just feel hopeless and need to know If theres any success stories for cramming at alevels.