Yes, I am in the same boat, but I probably won't be any help to you. I'm not sure what their acceptance rate is or what criteria they look at the most, but that is what I'm most curious about at this point. Most likely, I'll only ever find out whether I make the cut or not.
I thought the Kaplan test was alright. Comparing it to the NET test, the questions on the Kaplan were more pre-nursing-specific. The NET had some geometry, electrical circuit, and thermodynamics questions, for example. The Kaplan stuck to anatomy- and physiology-type science and math problems that you might find in dosage calculations. And the reading and writing, well they were about what I would expect to see on a reading or writing test. On the NET, the reading questions were far more difficult, where I felt you had to choose the best shade of grey so to speak, and I found the time limit on the reading very restrictive. On the Kaplan, the answers were more clear cut and I had plenty of time. On the Kaplan, I got the most questions wrong on the science section by far, because you either knew those answers or you didn't. But it doesn't matter if one section is particularly hard, because they are looking at your overall score (I think). Ultimately I scored in the same percentile on both tests, but some people might not.
Outside of the application process, the main thing I'm wondering about the CMMC program is why their failure rate has increased from 25% to about 50% in the last several years. Are they admitting more people and therefore getting a little less picky? Or, has the program gotten tougher? If I'm accepted I'll probably ask them myself before deciding how many regular hours, if any, I'll work in the fall.