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
Candidates can check B.Tech Cut off for Top IITs & NITs here.
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