I took the ASTB yesterday, and it wasn't too bad. The hardest part, I think, was spacial apperception. My suggestion to anyone trying to study this is draw your own pictures, with no clouds and focus on going out at 45 degrees from shore with banks. As for the rest of the exam, the study guide on this site is great, and the ARCO book helps reinforce what you study. I am not sure how I did yet...will find out tomorrow afternoon.