see.. u are following the coaching notes... okay.. but dont go for the theory in them.. unless if it is too nice....
and ya .. u need to b corrected... u need to buy the books...they are a very essential part for the preparation of jee and aieee..
about time management... then it is up to u.. because it is u who has to study .. and so u need to make a time table for urself...
considering your time for schools, tutions or coachings.. then sports and other things.. u need to see where u are getting the maximum time for studying... also decide which time is suitable for u to study.. morning .. late nights..evenings or afternoons. and frame your time table for that time period..