for iit jee if u have already studied some of the syllabus of jee,go for hc verma in phy ,op tondon in chem and ml khanna for maths
THE BEST BOOKS FOR BOARDS ARE
FOR IIT GO THROUGH H.C.VERMA FOR PHYSICS IF YOU FIND IT INTERESTING.REVISE PCM OF IX.SUBSCRIBE JUNIOR SCIENCE REFRESHER,
DO RATE ME.......
i would say schand for PCM.
for jee ( i too am in X ),
for early preparation stage ( such as the stage i and u r in),
physics - resnick and halliday ( classic and interesting too )
maths - try out class XI math stuff, u can have plane trignometry by s l loni.
chem - university chemistry ( Bruce. H. Mahan ) ( good book )