I just passed step 3 - and here are my scores and Study materials:
Level 1
Scores: 466, 80
Study Material: First Aid 1, COMSAE - score 540.
Level 2CE
Scores: 409, 76
Study Material: First Aid 2, Combank
Level 3
Scores: 372, 76
Study Material: Crush 3, Combank
I passed all 3 on my first try, the last 2 parts just barely. Combank for part 3 was the same as for part 2. The COMSAE was worthless because it gave me a false sense of security - I did almost 100 points worse on the real thing. First Aid 2 is crap. I liked Crush for step 3, but it's not enough to do well, just to pass.