[Question]Doing Stats II after failing Stats I. What do I actually need to go back and learn before the midterm?

I'm doing an Economics degree in Portugal and I'm in Statistics II this semester. I failed Statistics I last year. I had an internship at the same time and never really sat down and learned the distributions properly, I just sort of half-followed the lectures and hoped. The rules let me enrol in Statistics II anyway, so now I'm doing the second half of a sequence without the first, which I'm aware is my own doing. I'd like to fix it now instead of being confused until January. The calculations aren't really my problem. The notation is. I lose track of what's a parameter and what's an estimate,