first of all finish ncert text b'cos its the basic...
thn if u have enough time,thn opt 4 any additional books like R D SHARMA n others.....
u may also practice wid previous years questions, sample paper questions etc..
if ur basic is clear thn wats the prob....
never mind 4 the questions thn....
solving R D SHARMA doesnt mean the questions will be asked frm it, but its just 2 practice a variety of questions...
first complete ncert text's each n every question thn practice pre yrs queries....
b'cos i dnt think v have a lot of time....
n 4 rel n fun.. first practice out ncert book thn solve pre yrs ques......
most probably the questions will be frm proving part in the fun...
into fun, onto fun, combined funs etc.....
n dnt 4get 2 study basic topics......
neways.
ALL THE BEST