I am starting italian gcse, so I can't relate fully to you.
1) Use quizlet to summarise vocab and test yourself, but don't make a flashcard for every word in the language, because some words might be in your head already so no need to go through that more
2) Start looking at the language and learning a bit of it - it helps trust me. I started italian on duolingo for example and have been doing it for about a year and a half and it helps because you know extra vocab, you are introduced to the sentence structures and you might have already covered certain topics, so you're ahead!
3) Try to stretch yourself more - like watch a movie or series in german with subtitles on or buy a german book or look at german videos online, so you bring your language learning outside of the classroom
I hope that helps and good luck!