Yup! Oversplits is when you do the splits over 180, so like your front leg or back leg or both legs are on something higher when you are in splits. Don't worry, you'll learn the names fast when you're in the gym.
Usually gyms call the class right before the team level Advanced. There could also be some girls in the class who just don't want to compete and so do that. That video could be like what the pre-team/early team would look like - they are working on compulsory routines. In the lower levels floor exercise is also an event - in higher levels it is rope, hoop, ball, clubs, ribbon.
Here's a level 5 routine:
Rhythmic gymnastics competition training
[youtube]fbG28KOI7l8[/youtube]
more level 4 routines:
Rtythmic Gymnastics Competition Practice
[youtube]das5KFXytBk[/youtube]
Here's a couple level 7 routines:
Elliana's rhythmic gymnastics Level 7 floor, CO 2008
[youtube]DSKeDf-vNMU[/youtube]
Elliana's rhythmic gymnastics L7 ribbon, CA, 2008
[youtube]93NcQDI12GQ[/youtube]
Some clubs compete level 3 too, but level 4 is the first competitive level that has State and Regional Championships. The levels go 1-10 and elite is the highest; 4/5/6 are called compulsory 7/8/9/10 are called optionals.