get padhuka book for costing/fm ... its exam oriented and it will clear you concept.
since you have only 3 subjects.. so carry on all the 3 subjects (in a day) together for next two months ... this will increase your practise of the subjects and boost you confidence.
do as many practical problems as you can to overcome your weakness in practical paper (but clear you concept before )
obviously never skip COMPILER AND RTP..
make it a habbit of revising theory everyday and solving question papers(after you hv finish your theory subject) ..it will increase your writting speed ...as in exams you have to be quick and give neat presentation.
and ofcourse.....dont lose you focuse for even once ... just look at you goal...dont look left or right (i.e other problems of life) or you will lose the things.
ALL THE BEST