Not all classes are available every quarter. This is usually because their are very few members in the faculty who teach multiple subjects. The faculty tries to manage your scheduale by sending recommendation of courses students should take. Students don't have to follow their recommendations, but it is highly encouraged. Registration and your advisor's course recommendations are given at halfway through the quarter. This should give students plenty of time to figure out their scheduale, but it is better to register earlier. If the class is full by the time you register, you would have to hope that it's available next quarter.
Unfortunately, even through your advisor's recommendations, the scheduale might end up very odd. For example, you could end up having to take one class early in the morning and another late at night during the same day. Or you have two full days of classes, but you get the rest of the week off. Or even having a 6 hour class being only availble late at night.
If you a class doesn't work for you and you prefer to be transferred to another class, the school allows you to switch during the first week without any reprucssions. However, it is very strict about attendence. If you miss a couple of days, they will fail you for the class unless you can get it appealed. Transferring credits are a hassle. Since most courses are unique to the school and doesn't off traditional courses as other colleges, those credits are not counted and just disappear even if you are transferring to another Art Institute. If you want to transfer to a traditional school, since quarters go by quickly, any course credit that can be transferred over will be halved.