My entire physics class notes consisted of just three 200 page notebooks. What was important was that I knew the story behind each word written in that notebook. I sat in the class like a monk, not missing a single word the teacher said and at the same time interacting with him whenever possible. Any doubt and I would get it cleared then and there. And this made classroom learning my major source of theory and concept learning. Though we used to solve just 3–4 simple formula based questions in the classroom in a day.