U can buy second hand from the shops
Or from some of the resonance passed out student
there are many shop in kota, delhi- kalu sarai, punjabi bagh( other coaching areas) form where you can get photo copy of study material at a very cheap price...& as i checked for online you can go to olx....the price is also low
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile