The first thing I tell a new student is to forget the "level" of the class and I ask them "What do you want to learn?" Every class is different and no two teachers look at "levels" the same way, so the label is really meaningless in helping you decide what class to take. 

There's a popular saying among dance teachers: "Beginner students take intermediate classes, intermediate students take advanced classes, and advanced students study basics."  The reason for this?  It's because the most experienced dancers realize that it's the basics - the foundation of the dance - that makes the rest of their dancing great.  The best way to decide which class to take? - Talk to the teacher and let him help choose the right class for you.