dear friend no need to worry.as you are just starting your preparation it is obvious that you will take time to have basic knowledge of something.try to solve as many problem as you can you will definetely be in a positive side.
about cracking jee its a matter of selecting right way in a right direction which ever coaching institute
try to have faith in it and be sincere in your study.you will definetely crackiitjee.
best of luck
thanks and regards
sunil kr
askIItian faculty