You can see the complete fee structure of NIT Silchar on its website. I am also giving the link below. You can visit the link below, it will directly take you to the fees structure. But as I can see in the fee structure you do not need to anything, on the other hand you will get Rs. 13500 adjusted in second semester.
http://www.nits.ac.in/academics/info/Fee%20Structure/Fee_Structure_1st_Sem_BTech_2016.pdf
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile