It is Important to do revision From the starting of 12^th ?

hii shubham 

yes , it is important to revise from starting of 12^th and 11^th because in long duration you forgot everything , and when you will start revising it seems that you are studying from begining , so it is very important to revise , it is the thing which matters at the main exam , make a short notes of one chapter and keep on revising , hope this will clear your doubt , please aproove 

good luck