Hello,

yes you will get rejected no matter what your score is if you don't provide enough documents to prove the details you have given in application form.

If you have qualifying score in jee mains then you have to satisfy the cutoff to be eligible for jee advance. if you get good score in JEE advance then you attend JEE advance counselling process for sure.

Make sure to have all the required documents. if you miss anything then all this hard work will go waste.

Hope it helps!