I used both the Allen 2008 L1 and Schweser 2008 L1 and did a majority of the questions in each qbank. Allen questions are more difficult and more like the real exam, but their notes are terrible and will guarantee a fail if you rely on them–Use Schweser notes. That said, what really put me over the top on passing was doing the Schweser book 6 exams and really spending a lot of time on each q I got wrong.
Do as many practice questions as possible. As Joe Stalin said, quantity has a quality in itself.