I've done some corrections but the main point of the "most important lesson learned in college" is not clearly stated.

Your answer compares two schools you attended, but it doesn't seem to answer the question topic. However, I'm glad your college experience went so well!

I learned many things in college. Before college, my schooling wasn't the best. Though I studied in a private school, the staff and teachers were not experienced so I didn't learn what I expected to. When I went to college, however, the teachers were much more experienced and friendly. They taught me many things and I enjoyed learning. My experience in college was amazing and wonderful.