Hi,

If you wish to be admitted to NITs, IIITs, and other institutes through JoSAA, you should have completed class 12 examination with PCM as core subjects and must have at least 75% aggregate marks or should be in the top 20% of your board.

Many boards consider Computer Science as a technical subject, but JoSAA does not allow it to be a substitute for Physics or Chemistry; it can only increase your percentage if your board officially includes it in the aggregate. So, if your marks does not meet 75%, you will be not be eligible for NITs, IIITs, and other institutes through JoSAA.

It be better if you consider to reappear for class 12 to improve your marks and fulfil the eligible criteria.