Hi I did ok in my AS results (ABCD) but need to resit biology (C) and Chemistry (B) to get A in chem and B in bio. Im doing them in summer with my A2 and want to revise AS early to get them out of the way. But how do i revise AS with new A2 work at the same time? My brain isnt that big! Any advice or your experiences will be greatly appreciated. Also with learning chemistry especially... How do i learn all the different mechanisms that are in AS and A2 and not muddle them between exams/years? Thanks for replies/help!