Philvane, the mask fit is supposed to determine which one of those masks you will need. I did mine through Mohawk just over a month ago. Everyone was tested for the same mask. Anyone who did not fit that mask then had to continue trying on other types of masks until they found one that did work. I am not sure why the company you are using would want you to pick just one mask to fit because that would defeat the whole purpose of finding the right mask for you. Pre placement services did not really know what I was talking about either when I called them about the mask fit and CPR. The woman who first helped me didn't seem to understand me and her English was very bad. I ended up calling back several times at a later date until I talked with someone else who knew more. If you go to the Mohawk continuing education site and select register online, you can select mask fit and it comes up with a whole list of dates at the start of January. Hope this helps! Merry Christmas =)