I used the Stalla Enhanced System last year (includes videos). I spent 400+ hours going through the readings, videos and practice questions, but still did not pass (band 6). This year, I am using the Schweser books and videos. Two things I am doing differently this year are as follows:
Writing my own notes; and
Focusing on really, really, really understanding the material as I read it.
I found that if I spend the time doing the two things above, all of the practice questions straightforward, and most of the answers I get wrong are a result of not reading the question carefully. Hopefully this will change the result in June.