Hey guys how's it going?? I take the test in a few weeks and am doing the best I can to prepare. After reviewing 3 ARCO books ("Officer Candidate tests", "Military Aptitude Flight test", and "Mechanical Aptitude and Spatial Relations") and Cliffs Notes "Military Flight Aptitude Tests", I noticed the Cliffs Notes version of the Mechanical Comphrension was considerably difficult then all other. Basically it went into physics 1 type questions. The ASTB Gouge Mechanical comprehension questions seem to be more like the ARCO. (easier). Think I should stick with the Gouge as an accurate represenation of the section?? thanks!