I didn't and I guess I would be pretty happy if I did.
When I think about why, it was because:
(1) I did not have a suitable environment for studying (I discovered this when I started living alone and made one)
(2) I felt more challenged playing online games
(3) Didn't have clear goals or a mentor or a target or something like that.
By no means I was bad at academics (at least not before university), so I had no trouble delivering all assignments, or doing university entrance exams. I did not skip classes, did assignments and so I guess I built a somewhat solid knowledge basis.
About (2) only later (as a highschool sophomore) I discovered how interesting were national math Competitions or any type of academic competition (I love competitions) and how different was doing good at these and doing good at school.
And about (3) while I had the wish to do good at these competitions, I didn't know where to begin, I didn't have any friends with a similar goal, nor a teacher to offer guidance. What I found later was that I did not look into the right places haha.
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So, wanna level up your academics abilities?
(1) Set a goal and then define priorities about what study first.
(2) Create a routine, you need discipline (That's the hardest step and I was never successful at that)
Or in other words: Do not waste your time with pointless effort. Be efficient and smart in what you want to do, for that you gotta learn your limits and act accordingly.