Most of the questions are the same from what I remember. I took the MASS, POSS, and TECH in a two week span. The MASS and POSS were incredibly similar. Tech was stupid easy. (Not what you asked, just sayin I may be "Cross threading"). I just used standard online practice tests. The questions were about the same, perhaps slightly more difficult, but not ridiculous (just MORE of them obviously). Conversions are a VERY small part of the test, dont freak out about it.
These arent tests to determine your knowledge, these are tests to determine your grace under pressure. Ive said it several times, its 7th grade math, 5th grade assembly, 3rd grade graphing. Its all about the time crunch.