if you are trying to improve your score to get into top college,then its good.do not worry.join any coaching institute if you are not satisfied or 1 year programme.or you can prepare of your own
dialy study or practise problem .
start from the very beginning such as reading NCERT and find your own fault wether in problem solving or lack of concepts.
make a 1 year routine divided into month and then into day and hours.
complete your entire syllabus 2 months before.
join test series after completing your sylllabus. of any good coaching institute.
last 2 month torough revision of the entire syllabus.
I think with this you will achieve a very good rank.
thanks and regards
sunil kr
askIItian faculty