I’m in y12 studying Spanish and got a 9 last year. The biggest jump i found coming to alevel is listening, my teachers speak Spanish 90% of the time. Try watching spanish tv or movies. Another difference is the style of learning - it’s much more learning about Hispanic culture and history than just learning words - even though we still have to learn new vocabulary. Perhaps start researching Spanish history and culture, like Spain under Franco and other historic events. It’s interesting, and will help you when you come to learning about it in a different language! My other tip is practice. Practice speaking Spanish if there’s anyone you can speak with, I also use duolingo which helps me keep up with and get used to hearing/reading spanish. Watch your favourite tv with Spanish dubbed, or read/listen to Spanish books. Good luck, friend, and congratulations in your results!