Hey aspirant, If you are from general category then in order to get admission in a branch like mechanical you will need to secure a percentile above 97 in order to get admission in any of the NITs.

Some of the NITs require percentile above 97.5 for being eligible for admission in Mechanical engineering.

I have told you the percentile range on the basis of previous year cutoffs of various NITs.

You can look for the cutoff on the link below for various NITs and IITs:

https://engineering.careers360.com/articles/jee-main-cutoff

Hope this helps.