Is it even possible to get the "perfect" schedule?

<p>oh okay. I just tried to get the codes for an hour.
However, the majority of classes were closed!</p>

<p>and a lot of them were waitlisted. So what does that mean?
Also, since most of the classes are closed, what do i do? Like what if i choose a class, and the professor’s rating on websites is terrible?</p>