It is very difficult to predict the exact admission criteria and cutoff of NIT SILCHAR since counselling has not yet started.

For specific of NIT SILCHAR follow through the link provided below for exact cutoff of various streams

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

However you can also go through this link below to check the admission criteria for various NITs and cutoffs of them for previous years.

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

Good Luck