even i had the same problem in 11th......i wasted my entire 11th in these problems.
trust me u have ample amount of time remaining to get a gud rank in jee if u start soon......
the theory in the varios corresp courses r not so gud...and its not so easy also if u r trying to learn them by self study........
if possible pls join a good coaching centre.....trust me dat really helps to clear ur doubt and get a hang of problem solving.......
i learnt the above facts from my own mistakes......
for books since u have quite some time remaining start from ncert for physics and chem.......read theory from them
after dat do the following books,,
physics-hc verma(its not dat gud as complared to dc pandey for theory...but the problems in it r quite gud )
dc pandey-pls buy the theory books espesiallt mechanics part 1 and 2 ...also buy its electricity and magnetism book....trust me they r really good,,,,,
for problems pls buy "new patern objective physics for iitjee"by arihant
the dc pandey books r really gud........
maths-
do kc sinha for algebra dn calulas(theory and basics) then buy a arihants difrential and integral calculas for good problems....
TATA MCGRAW HILL for iitjee is also a damn gud buk for problems........even objective matematics rd sharma is quite gud.
chemistry-
buy op tondon for inorganic and physical chem
for organic buy arihant or mtg interactive organic chem ........
but rember FOR PHYSICS AND CHEM NCERT MUST BE DONE FIRST TO GET UR BASICS RIT....
ALL THE BEST....