I'm not really sure how I feel about the EK 101 tests. I do well enough on them (usually a 10-12), and the actual passages themselves are pretty good representations of what you might get on the AAMC exams, but the questions are so nit-picky and weird. Some of the justifications for answers are pretty bad as well. I do feel however it is the best resource out side of the AAMC, just don't get too disheartened by it.