Hi,

For any NIT or IIIT, you need to have a minimum of 75% in your class 12 which means that you have to score 75% in your GSEB board. If you belong to Gujarat or are writing your class 12 there, for JEE Main, that will be considered your state of eligibility so you could also come under the top 20 percentile to apply under home quota. For that you need atleast marks as give below

GEn -367, OBC-344 SC-336 ST - 309, PwD-309

This is the Gujarat board Cutoff for top 20 percentile in 2017. I am giving this for an idea. It may vary slightly.

So if you have 75% or marks above the 20percentile listed above, you have a chance for admissions in SVNIT provided you qualify in JEE Main ofcourse.