sir i have now 5 months so what should i do im an student of maths preparing to crack iit with under200 rank pplease contact me

@ abhijeet 
frst of all dnt frustrated , just continue the preparation that u are doing . 
and as u are in the last phase of your preparation , then just its time to cover and wrap up the things quickly . 
if u want 200 rank in iit , then its obviously difficult , but u donot have much time . 
now just focus on your board exam , and in each wekends , take a look at the previous year jee questions . 
and remember – donot lose your time in physics just by reading the theory , always go for numericals. 
do previous year question paper chapterwise as soon as you covered 1 chap in class 12 . 
donot repeat your mistake . 
take mock test at every 15 days on full course andcheck where u are actually weak . 
and never loose your personal hobbies beacuse that is concentration booster . 
ALL THE BEST ...