For what it's worth, I thought step up was a fantastic book. Personally I felt like my med school career started when I began studying for step 1. As such, I felt my level of knowledge was subpar and starting with first aid from the beginning was like reading greek. So I started with step up instead based on a friend's advice, and I thought it was an awesome book to recap with. Having said that I would recommend that you FINISH with First Aid. This was part of the strategy I used, and I feel like it worked pretty well, especially based on my starting point.