Infinite wisdom,self belief & self-confidence are essential ingreidients for cracking JEE........the reason why you solve problems  is to increase the hidden elements of self confidence in you...besides gaining basic knowledge you  must battle with  more and more problems....the more you encounter them..the more you learn..and master all those elements  required to crack JEE....there  is  no talent,,nor any god gift behind success.........its already there within you...