What are the sub genres of Teen Drama films?

There are two different types of Teen Drams. These can be recognised as:

Youth Dramas:

These tend to stay away from the typical, sometimes cheesy perceptions of teenagers, and, like an Indie movie, are more hard-hit truth. An example of a Youth Drama is "Submarine", a film starring Noah Taylor, which is about the coming of age of a Welsh teenage boy, who has "a lot of things on his mind". 

and High school Dramas

These tend to be slightly more unrealistic, and more about the entertainment element. They can sometimes over exaggerate the status, lifestyles and appearance of those who attend American high school, such as the categorising of tables and the types of people who sit at them, like in "Mean Girls", for example:

They are sometimes - not always, supported by the Majors in the film industry. Maybe, because Youth Dramas are more realistic, big companies such as Sony or Universal will be more attracted to High school Dramas as they have a better chance of gaining the most success, because, statistically, the general public find these more entertaining.