When I was in school, I was mainly a B student. Mathematics was one of my weaker subjects; in fact, it got so challenging that my mom got me a private tutor for it. (On an ironic side note, one of my weakensses in HS wound up being one of my strengths in college.) Miraculously, I never failed a math class.
Science were a slightly stronger subject, but I will admit that I failed biology in the first quarter of my sophomore year. It turned out to be the only quarter were I failed ANY subject, thank God...
As for history (or "social studies" as we called it), despite my up-and-down performances on the exams, I still passed with good grades (mostly B's). I did better in English, IMO...
The easiest ones were band and physical education (I still passed the latter despite my lack of athleticism)
I contributed part of my success to a class called "Resource" in my HS, which allowed me to do some of my assignments right then and there and save the rest for home.
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Shoot for the Moon; even if you miss, you will land amongst the stars.