the way u've described  ur state boards.... it seems u  gonna giv maharashtra state board exams..... So called HSC !!! 

 

Well don wry this is the same   case wid me too n wid all my fellow frnds aspiring For JEE n frm HSc board...

 

But as a solution..... Whenever its ur unit test or terms in ur college for 12 th... devote max. time for ur 12 th lessons .. so dat after units or terms u are perfect wid dat many lessons....

n the rest of the days just concentrate on JEE syllabus......

 

 

N in month of Jan..... around frm 10 th  jan or so..... Start on wid ur 12th syllabus.....  wid full force............ And devote half the time which u take for 12th during this time for JEE......

 

And ha do 1 chp frm all the books so dat u get d links properly...

 

Hoping this might help u !!!!