Trying to cheat their program's by practicing them will only do you harm because you haven't really learn the skills they are looking for.
Utter cr*ap. Practice as much as you can in preparation for any of these sort of tests and I would recommend having a look at the EPST site where you'll find examples of what to expect with the Compass battery. Refresh you memory with respect to GCSE/High School Level maths and physics - emphasis is placed on mental arithmetic and simple problem solving whilst multi-tasking, and get copies of personality and basic cognitive reasoning type books for examples of the style of questions you may see at interview. I hear COAA is ditching Compass for CASS - if this is the case then what you have practiced for Compass may be the opposite of what you find on the day. Good Luck!