Also, I didn’t know what the fuck I was interested in or good at as a teenager. Primary and secondary education needs to be broad and well-rounded.
I want to push back on this a little. All the time I spent in English literature class and French language lessons were wasted. I knew that wasn't related to what I wanted to do for a long time, and it still isn't. I forgot everything from those classes.
I literally took extra history classes that I didn't need to because I was interested in that subject. But I couldn't go all the way with them because I could only sit official exams on my official subjects.
Had I not been forced to waste time on English and French (especially french), I would have had a much better high-school experience. I might have taken up music as well.
The whole experience with subject choice really depends on the student.