Hello aspirant,

NIT's are the top institutes of India for engineering after IITs and it is very tough to get admission in this college's. Also if your sc category rank is 7215 then it is still very low and there are less chances of you getting a good branch in good NIT. Admission depends on various factors such as category, home state, branch , etc. You can also go through the previous years cutoff  as

Link- https://engineering.careers360.com/articles/nits-cutoff-for-top-btech-branches

Hope this helps 

If any queries feel free to ask

All the best!!!

Regards