The cjances of getting the IITs are about to zero because the IIT demands the rank of around 900 to 1000 for the reservation so you will not be able to grab the IIT. There can be the chances of NITs for you but the admission in any of the NITs will be based on the cutoff marks or cutoff ranks according to the branch. Here you have not mentioned the branch which you want to get in NIT as the cutoff varies according to the branch also. A link is attached where you can find out the cutoff marks for the various NITs branch wise and you will be able to compare and select the NIT according to your course or branch.

https://engineering.careers360.com/articles/nits-cutoff-for-top-btech-branches/amp#referrer=https://www.google.com