Are american high schools like how they are on TV and films?

[Virginiá]

Cheerleaders didn't walk around like that all the time at my HS, but some days they would if they were practicing after school (or there was a game later on). A number of the jocks wore their jackets more often than not. I don't remember how many pep rallies we had a year though - at least a few. I didn't always go to them.

Knowing which films/tv shows you are thinking of would help because some overdo it or are straight up parodies while others may be based off of memories of a HS not representative of most.