Keep ya chin up,
We all have been through the mill with exams, I did the old CAA system so am not too familiar with the JAR groundschool however I am sure it six of one and half a dozen of the other.
Keep on at it, I didn't pass them all on the first attempt however, the two that I did fail I passed with flying colours on the second attempt and also found it a little easier. (ie. Only two subjects to concentrate on!!)
Don't give up!!
Good Luck