What all i​got to do in order to make it to iitb cse

@ sanjay 
I think you are asking about study strategy , if so, then below are the things that u have to do . 
frst of all u need to understand that u have to clear both JEE main and advanced and in advanced ur rank needs to be within top 400 to get iit bombay cse . 
FOR THAT , u need to join a test series and a coaching programme , u might join askiitian as its good , or also u can choose offline classes if ur not intrested in online . 
the last 6 years jee advanced paper needs to be solved for sure . 
and in these 2 years (if u are in class 11 ) then u have to devote in PCM and by clearing concept also , 
ncert is the fundamental book , donot ignore that specially for chemistry . 
and donot even think to rott any concept , there are certain topics in chemi that u needs to remember , except that understand everything by derivation and proof . 
do practice some good no of problem everyday from h c verma and irodov . 

for maths refer m l khanna and completely solve the book . 
at the last period of preparation , u need to give at leats 10 mock test based on jee advanced difficulty level . 
ONLY THEN U CAN ENTER INTO IIT BOMBAY CS BRANCH .. 
REMEMBER ITS THE FAVOURITE BRANCH OF EVERY ENGG ASPIRANTS . 

ALL THE BEST ..