Practice is key, to develop your skill in pretty much anything even music. Students have to regularly practice what was learnt in class in order to gain a complete understanding of the concepts taught in class. This could be a new technique, new theory concept and so on. Also when a student revises the portion at home, he may also get a few doubts which could be clarified during his next session with the instructor. So it is imperative for all students to practice regualarly, whatever was taught to them in class that day.