which book do you recommend for calculus part which is very useful for doing some good sums...i already have amit agarwal ..... how about cengage??.....

DEAR BROTHER ,

IF YOU HAVE JOINED ANY GOOD INSTITUTE FOR IIT ( i.e resonance, bansal kota , fiitjee , vidyamandir) then kindly properly do all problems of concerned sheet or package providd to you. moreover, amit agg is good book and you can read m l khanna for iit and other competitive exams . my strong suggestion is don't bother about books. simply take 2-3 (max) and do problems in  that  properly or religiously.  CENGAGE IS BETTER BOOK.    

BEST OF LUCK FOR YOUR FUTURE ..........( DO SMART WORK IN ADDITION TO HARD WORK)( GENIUS IN 1% INSPIRATION 99 % PERSPIRATION)..........