I would agree with Tiffanies. I studied out of the HESI 2012 manual, and covered the vocabulary etensively as I was told by the nursing advisor hee in Arizona that it was the hardest part of the test. Even though I knew all of those vocab words backwards and forwards there were others on the test I hadn't seen in the HESI guide, quizlet did close that gap a bit though. My best advice is to know the study book, grind the practice on quizlet, and you should be able to obtain a passing score no problem.
PJ - The math portion was weighted towads ratio problems HEAVILY. Most of what I saw was converting fractions to deimals and vice-versa, adding subtracting and multiplying fractions, very few word problems (which were quite easy), and percentile type algebra stuff like X is what percent of some number etc. I suck at Math BAD and I studied out of the HESI official book and passed with a 95% after studying lightly for two days maybe an hour each day. It's no problem, both of you can do this now go kill it!!