Dear vijay kumar
If you belong to general catagory and if you will fill less than 60 % marks in 10+2 ,then you will not be considered as eligible condidate. your application form will be rejected.
and if you r reappering in 10+2
then you should fill the form as 12 appearing candidate.
Please feel free to post as many doubts on our discussion forum as you can. If you find any question Difficult to understand - post it here and we will get you the answer and detailed solution very quickly.
We are all IITians and here to help you in your IIT JEE preparation.
All the best.
Regards,
Askiitians Experts
Badiuddin