One thing I thought that was particularly telling about our educational system was how in my freshman year of high school my English teacher told us, "Forget everything you learned about writing an essay." Strangely enough, in my freshman year of college, my English teacher told us, "Forget everything you learned in high school about writing an essay". I couldn't help but laugh. It was a perfect example of how all of the layers of bullshit in high school of "preparing you for college" don't mean a single thing (at least in my case).
I really enjoyed my English 101 class, because a good portion of it focused on all of the problems inherent in our current high school system. Our main textbook made the argument that we should completely do away with high school, and just send kids to a college-type school. Something about that just feels right to me, because from the day I started high school, I couldn't wait until I got to college and was able to choose my own course of learning.
I also think that high school (and now moreso than in the past, middle school as well) is damaging to the students locked inside. School shootings are a very important example of this. The social caste inherent in any high school is really quite horrible and disturbing. So is the extreme emphasis placed on things like sports and cheerleading, whereas the debate team or DECA get no recognition.
Teenagers are smart. They may be extremely unstable due to changes in hormones- but speaking from a top-down perspective, they're still quite intelligent. I think that if we allowed them to have more control over their education, and decentralized the school structure (making it more akin to a University), we'd see a big reduction in the number of problems teenagers have.