Self study is so very important. What we learn in a class should be revised on a regular basis. A regular revision not only increases our capacity to retain things in the long run but also help us develop a power of concentration and learn and adapt things faster. According to some reports, the chapters taught when not revised on the same day will get blurred and within 14days it would have been lost by the memory. However, revising on a daily basis helps to retain the information for longer during. Thus, self study is as important as school or college lectures.