Hello there!

Greetings !

First of all I want to make one thing clear that only scoring 75 percent in class 12th doesn't make anyone eligible for jee advance , in order to be eligible for jee advance,  you need to clear jee mains but yes since you have scored more than 75 % in nios boards so you will be eligible for nits , iits etc if you performed well in jee as nios board is a recognised board and it is accepted by nits , iits etc. So , prepare well for jee

thankyou