I had very little freedom in high-school compared to university. In high-school, I did all science courses but it was always obscured by courses I had no interest in, such as English, history, P.E., Civics/government and Careers. In university, I had to take one credit in humanities, which I didn't care for but once it was out of the way in first-year, I could take the courses I wanted. I was able to pursue specialty areas, such as neuroscience in immense detail without having to worry about some piddly mandatory course. Admittedly, some university courses I liked but wasn't that great in because no matter how much I tried, I couldn't get my head around the material, so I avoided those courses. Most recently, I got to take research-based lab courses and give lectures on topics I loved, and not just read a book and do tests.