JEE Main

With low score in JEE Mains you will not get the good colleges as in government colleges but you can contact to private colleges.

There is no chance in NIT with this percentile in JEE Mains.

There is no chance in NIT with this percentile in JEE Mains.

Cutoff percentile will be above 85.

I don't think you can get any college through JoSAA. Try for private college or state government college.

Yes, chances are good. I think he will get CS in fourth or fifth round of JoSAA.

You can apply for it. Chances are very less but still you should try for it. You may get a seat in last rounds.
https://www.shiksha.com/college-predictor

Hi
https://www.shiksha.com/college-predictor
Use this link to know about the colleges available to you.

Hi
https://www.shiksha.com/college-predictor
Use this link to predict your colleges.
https://www.shiksha.com/b-tech/jee-main-exam-cutoff.

Hi
NTA allows some corrections in the mistakes made while filling out the form. A window is given to students for this before the commencement of exams. However you have already appeared for the exam. You may attempt this when similar window is given to the students by NTA during April exam cycle. In the meanwhile I am attaching a link that will give you some information about this. https://www.shiksha.com/b-tech/articles/jee-main-correction-blogId-1943.