Hi,
I wouldnt even think of attempting that. The ATPL ground school is there for a reason - for you to learn the information that is vital to a Professional Airline Pilot's career.
Anyway you have to do a minimum number of study hours before the CAA will allow you to attempt the JAR exams, - I believe for distance learning students that also involves a some classroom time.
I totally would agree that the Bristol Database is an excellent tool to prepare for the Jars - it is only that - a tool. It should be used along with a good set of notes, maps and CBT.