hiiii!!!!!
u still have 2 months in hand...
so just give 1 month for the subject u r weak at..
try to focus on the important concepts...
try doing more of previous question papers and mcq's..
try to clear ur concepts...
and keep revising simultaneously too...
hope this helps..and remember....don't loose ur confidence......
jst keep working and u'll surely be through.....
all the best!!!!!!