dear naman , first u should complete RD sharma & buy some good book of 10_th class level for phy , chem (by S chand) ...

make each n every topic clear n no need to solve higher level iit question^'s from now , first complete ur 10^th slyabus properly  n surely u will crack jee...

if any doubt comes to u then ask on this forum....

all the best

join any coaching classes...................