I would like to bulk buy revision guides for my KS4 groups for next year, especially as some year 9 parents are already asking for recommendations now. I've had a look at the Letts books and CGP, but can't decide which ones to go for, especially as they vary in price and don't always come with audio CDs. We will be using AQA from September. Students are not allowed to take text books home with them so need some extra support at home. Can anyone recommend the guides they use? Many thanks.