There are two ways to leave a class. You either drop out, or you withdraw. Dropping out usually means you are going to get a failing grade and you don't care about it. But primarily, dropping out refers to leaving college life altogether. So if you intend to say that you dropped out of a class, you should use withdraw. There are several time periods for withdrawal. The first week, there is no penalty. The second week up to the first month, a W will show up on your transcript. And finally, withdrawal after the half way point will give you a failing grade. But this is dependent on each school policy. So learn the withdrawal format of your school. I was using the dates mentioned above only as an example. Let's learn some sentences to say these kinds of things.