There are two kinds of people:
1. Memorise the answer
2. Study you butt off
Let me start with saying, QB is a "must". I did my first module without a QB. Got 87%avg., but could be at 95% if I did use QB. QB is a great tool if you use it correctly.
EASA is still in the process of changing out questions, so STUDYING is your best friend. How you do it is up to you. Whatever works best for you.
For me - just listen to the instructor, do few exercises. Do QB for the topic and read more about subj., if I make many mistakes.
As for QB concerned, I would recommend Aviation Exams. The main reason is their explanation and comment section - a lot of good stuff there!
Another thing you might consider - donīt follow school syllabus. "Save" some subj. for later. Donīt do all the exams in 6 months, but safe MET/POF/GNAV (as an example) and do them 3-4 months after you finish your ground school.
You still have to study those subj. during the school. However, you may use fewer resources on them and concentrate mainly on the subj. you will have exams on.