OK, I do French, but hopefully some of what I'm about to say will be useful, especially as I do AQA too. I do the following:
Get a sheet of paper and write all the tenses/grammar I don't know or find difficult on JUST THE 1 sheet so I'll be minimising my revision and keeping myself motivated (i.e. there isn't much to learn!)
Keep a vocab book with me all the time, jotting down new phrases/vocab continuously
Watch the news to help with the listening parts (our teacher tells us to watch a piece on the internet and either answer a series of questions e.g.what, where, when, how, who, why or if it's short and not too fast, write a transcript)
Read as many articles in the target language as possible, adding to the vocab book and perhaps devising questions for yourself so you can practice commenting on events in the past/in the third person etc
Get hold of as many past papers as possible- you will recognise trends and often there are stock phrases that catch people out so sometimes they repeat them- you'll be one step ahead!
Hope that was helpful, it works for me anyway! xxx