Do not under estimate the ground exams. They are tricky. There is no consistency with how difficult the exams you sit will be, some months they are harder than other months.
Do not rely on feedback questions to get you through. The question banks are being topped up quite quickly now it seems and the Learning Objectives are nothing more than a guide of what can be asked, the JAA reserve the right to ask whatever they feel is a relevant question.
It is possible to crack the exams in 6 months but best to allow 9 months to allow for any resits and the CAA will not neccesarily be sympathetic to your requests for speedy re-sits.
Best of luck.