OP, the problem is any "class" is designed to make the students pass tests so the school gets funding. Practical skills is irrelevant to (and in fact, a detriment to) your ability to fill in the correct bubbles on the scantrons. It doesn't matter if you actually learn how a car works in reality, so long as you learn how to pass the test about how the car works in theory.
You want actual experience with cars? Find someone who works on cars and apprentice with him in any way you can. Volunteer at your local mechanic's shop, sweeping floors or whatever shit they need done, and pick up what's going on around you. With luck, some old salt will see you and bestow some of his ancient knowledge on you (and maybe bestow his ancient semen inside your tight youthful ass while he's at it). Human learn by doing things, not by looking at fucking textbooks with pictures.
As for myself, I have a couple funny ones. I took a class in high school, Anatomy and Physiology, that was notoriously difficult. Despite not being an AP class, your grade was scored on your GPA like one. Every year, about 75% of the class would quit after the first month. Well, it turned out the reason was mostly because the teacher was a dunce who couldn't really teach worth a damn, and would frequently make mistakes in his lectures. Having a background in this topic (read Grey's Anatomy for funsies as a preteen), I could usually recognize this and would just read the textbook anyway. Tests were based on the textbook, not his lectures, *laughs out loud* Long story short, most of the class would get 50-70% on tests, while I would get in the high 90s. Yeah, I was the "curve-breaker"; he had to curve the test to the student below mine, so I scored like 120% on most tests.
There was also the time when my Genetics class was going to have a Jeopardy!-style quiz tournament to review for the final exam. It was supposed to be one half of the class versus the other, each having five buzzers, but I practically dared the teacher to have it be me versus literally everyone else. And the silly fuck actually allowed it. Me with one buzzer, nine other people on the rest with others behind them so they could whisper answers. And I kicked their collective asses, with a final score something like 150 to 30.
I guess these aren't really a horseshit class stories. Just my reminiscing about my being an insufferable genius 15 years ago.