Respected ma'am,

Although 10 CGPA is considered equivalent to 95% only and I don't think much trouble would be caused. Still in the case you mentioned above you can write a mail or make a call to the responsible authorities and get the error rectified. This the link where you can find the contact information of administrative authorities - https://www.iisc.ac.in/about/administration/administrative-units (https://www.iisc.ac.in/about/administration/administrative-units/) and the contact number is - +91 80 2293 2228

Also, you can login into the site and check if the option for editing the form is available or not.

Else if, time and situation permits please try to re- register your child (if possible delete the previous registration).

Hope this helps