Many students think that if they just stop going to a class, they are withdrawn from it.
This is a wrong assumption. You must go to the Office of the Registrar and fill out the appropriate forms to withdraw. If you don't officially withdraw, a grade of F in the course will be recorded for you at the end of the semester. The grade of W will not affect your grade point average. If you need to withdraw after the official withdrawal period is over, you must appeal in writing to the Vice Chancellor for Academic Affairs for late withdrawal.