Oreleon- I was at Oxford for the exams- its overrated and torture. Choose the cheapest provider and go with them if money is tight. You can purchase the Bristol Ground School database with all the questions on it- the majority of them are identical to the JAAs- of course you need to study the stuff- but with this database you are as good as through- many who haven't used it have found that they are resitting a couple of exams!