How do you become a student at the high school?

"bellecee;c-18160402" wrote:
When your sim becomes a teen they will automatically become a student or alternatively, you can select "High School Student" under jobs.

I see that the sim is a student right now, but when I go to the high school, its just like visiting a lot. Like there is no timer or anything on how long you have to stay at the school or anything.