I remembered that when I was in class 9 not having any tutor and the rediculous teaching of my school had made me so tensed that I had decided to try online websites to clear out my doubts, I came across many good websites of which one of was Examfear.com, I loved the way they teach like a teacher can't acknowledge a student just by lecturing him.but if u teach student with animations will definitely make him having intrest to that topic.And I love the concept they made for students for clearing up thier doubts. Really this is one of the best educational app I have came acrossed till now.
