There is no specific store for the same. You can check in your nearbuy book store where you get competitive books. Also you check for the material online. There are many online portals which can help you with the preparartion material along with the coaching reference material.
All the best.
Candidates can check B.Tech Cut off for Top IITs & NITs here.
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile