hiii
Well u r not late .... start now .. it is fine ...
Now about the books ..
well,in mathematics u can refer Arihant books or A.Dasgupta .
In physics go for H.C.Verma ..
In chemistry ..for inorgaic use Arihant book ..
for organic ... well i used elixir but i am not sure whether u will like to use that ... u can use morrison and boylde .. better u go with the postal course that u will take ..
for physical u can use P.Bahadur ..
Now i like Narayana's study material .. u can try that ..
cheers