Hello Sohan.
U have given ur tentative marks in boards and the mains marks for  knowing ur selection in Karnataka. Now if u are willing to get admissioned in the NITS or IITS then the fee structure doesn't depends upon the rank u get or the marks u have scored in the mains exam or the boards exam.
But if h are taking admission in any of the govt state college or private college their then u might be getting some kind of scholarship as ur fee waiver.
According to ur marks u will not get more than 10% waiver on ur fees. Now every college has it's own fee structure so it is not possible to tell u how much u will pay.
Hope this will help u.
Good luck

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