Hello jagadende 

Firstly,if we are filling any regestration forms we should always be prepared earlier with our documents and information because this is going to be our initial step for our future . 

Do not panic the primary things that is strictly going to check by JEE mains exams conductors are your Name, Gender, Caste,Thumb impression,your 10th  nd 12th rollno. and result,and some your personal details about your guardian.

The income thing is secondary for this initial step but you should be always carefull for next time.

After some time of last form filling date an Email will come to your inbox for the recorrection of your filled form . You can follow the procedure and get it correcected.