what is the fee structure for sc candidates for b.tech courses in IIT and nit's? any other fees also please explain.
SC Candidates are exempted from payment of Tuition fees irrespective of their parental income in IITs and NITs.
For the other fees in IITs and NITs you can refer below link-
For IIT
https://www.iitm.ac.in/sites/default/files/uploads/fees-circular-jan-may2017.pdf
For NIT
http://nitdelhi.ac.in/fee_structure.php