Remember, if you are really committed, then go for it.
remove all sorts of distractions from the study area, remember no tv no games no cricket just study, if you are not clear at a point then just get it cleared either by asking your teacher or through internet.
Physics: practise numericals daily they must be according to the standard of aieee, they enhance your concepts. (solve IE irodov fully, Ncert books and dinesh iit and revise old question)
Chemistry: it helps u to score better,others ignore it usually and it becomes their weaker point so make ur chemistry strong (organic and physical should be very much strong) prefer op agrawal and atkins physical chemistry see sarin's numericals and ncert books
Mathematics: Just keep on solving problems.(varieties) in my view TMH and Khanna and Sharma is the best
Lastly the only solution is hard work, technical and unique study pattern, efficient and faster cover up of syllabus and you must have dealt with all sort of possible questions. Remember never loose a second as you can read a line in this time, so start studying. AIM to be No 1
>>>>>>for any type of engineering study the syllabus like iit pattern as this will give u and indepth knowledge<<<<<<<<<<<<<<