How do I quit my habit of cutting classes?

Make up your mind about going to a class and follow through. As an incentive, you can set a reward system for yourself, wherein every time you resist the urge to skip a class, you treat yourself to, say, your favorite meal. Once you get into the habit, the desire to cut classes will be less pronounced. In addition to this, also try and address why you feel like cutting classes -- whether you are bored, can't follow the lessons, find the classes too slow, etc. You can talk to the teacher and tell them how you feel, and work out a solution together.