hmm~ i'm really sorry to say this but i think it's really late to start studying right now when the exams are in a week.
i mean wot have you been doing all this time??
anyways... 12th may.. your first exam must be phy right? qp_06 i think
the practicle to alternative exams are not that difficult~
you should solve more past papers
i solved some qp_06 yesterday and it's really easy to guess wot they're gonna ask cuz there're just slightly different questions on the same topics.
there's always with the measuring stuff, circuits, mirrors and graphy~ everything's logical
you dont really have to know anything like in detailed cuz they give you the formula and tell you everything you've got to do
and the other papers are in june so you still have time for those~
it's the same with bio and chem. for bio, you always have to know the characteristics of vertabrates and invertb. or structures of a cell, graphs, enzymes, seed~
for chem, there're always tests for gases and metal ions, names of the instruments used in experiments, electrolysis, rate of reaction, graphs
for maths... you've just got to solve more excercises cuz if you dont, you wont be able to pass the exam
and there're always the same types of questions too
if you take core then it must be quite easy~ i'm taking extended and there's always 1 or 2 questions i cannot solve, it's kinda annoying...
well~ hope that helped... and good luck!