1. Really make use of the weekly speaking sessions - this will help you will fluency in your speaking
2. Teachers are always willing to talk to you about topics and discuss any queries you have - so use them!
3. Take up the opportunity to do work experience in Bensheim at the start of Year 13 - it's very similar to an exchange programme, but you also have the chance to complete a placement in a field you're interested in. Students really enjoy it and it's obviously very useful to be immersed in the culture you're learning about and surrounded by native German speakers so that you can pick up fluency devices
"Memrise" and "Quizlet" - use this to help you memorise vocabulary
Put on German captions for movies you're watching in English and change the language on your phone to German so that you're exposed to the language all the time and you can pick up new and useful vocabulary
"dw.com" - use the videos from this website to practice your listening skills