Hugely difficult. Understandably, you need to understand medical terminology so some testing is required, but this is overboard.
I went through a process for an online application and had an interview the next day. I barely was asked anything other than if I had any medical experience, and how many words a minute I could type. I was then told I would have to go through their training process.
TYPICALLY you are expected to sit through 2-3 weeks of "classroom training" (ie- the old abandoned conference room in the hospital) and at the end of it, you are given a test. You then begin 3 days of on the floor training. At any point during this time, there is no guarantee you have gotten the job. In my case, there was a minor issue with my paperwork, which set me back ONE DAY. Instead of training me with the rest of the group, myself and one other girl were both handed their "text book" and expected to do all of it on our own. A very negative exerpaince.