@ 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 ...
