Dear aspirant,

As you mentioned your son has done schooling from India and you all have been residing for 14 years . So you need not worry your son is eligible for the general category.

Coming to the fees of the colleges you mentioned-

VIT vellore- It has five categories and accordingly the fees increases. The first category total fees including hostel would be somewhat between 15L . The 2nd category has  almost 18-19L.

Srm - It too has same fees as vit vellore 2nd category.

Nits- These are government institutions and if of national importance. It has fees approximately 8L . But it is more less due to fee remission provided by the institutes bases on family income.