I took three years of Spanish and got an A every semester. Even when it was still fresh in my mind, I was nowhere near able to hold even a very simple conversation. And now just a few years later it's all totally gone from my brain.
My mother's native language is Spanish and she never taught me, which I resent her for. But I still find it incredible how shitty my public school education in Spanish was. We really should be teaching kids a second language from kindergarten up.
I had French and English classes in school. Although I only had French for 3 years and had English classes since primary school until 11th grade.
I'm fluent in English but I've retained little of French (maybe I can read and understand it a bit).
I think the English classes helped with basic vocabulary and grammar, but most of it I got from watching English media and playing games (including MMOs when I got to middle school), and then reading books in English since high school