seriously the best prep is to not stress about it. a lot of my friends in school did practice exams everyday, and i reckn they tried too hard. wen it came to test day, they were overthinking, rather than being themselves, and they didnt achieve good results. however, this is not to say dont prepare. i did the medentry course, but didnt even attempt any of their online exams. i just did a couple of the drills for sections 1 and 3, particularly section 3 BECAUSE IT IS THE EASIEST AND MOST LIKELY SECTION TO IMPROVE IN! i never touched section 2 coz its personality and u cant really improve that in a short space of time, u either have it, or u dont.
but yea, wat im meaning to say it, for the most efficient preparation for little time, just do drills or exercises for logic puzzles in section 3, and remembering the patterns, because most likely, patterns will repeat themselves. then work on section 1
oh yea, it got me a 97 percentile