Dear Ms. Aditi;
There are ?not a fix percentage chapter wise. this is not a board exam in which you have to pass a exam only , this is a all india compitition and you have tyo clear a rank in this. So there is not any short cut to clear this exam.There are soe imnportant chapter in chemistry like chemical equibirium, chemical kinetics,chemical bonding,cell reaction,aldehydes & ketons, named reactions, amines reactions periodic properties etc.
Please feel free to post as many doubts on our discussion forum as you can.
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you the answer and detailed
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All the best.
Regards,
Askiitians Experts
Pramod Kumar
IITR Alumni