The process takes up about four stages, 1) is the application, once the application is approve then you move on to the next step. 2) Online Testing (see your thought process). 3) Phone interview and 4) Would be a one on one interview.
When taking the test it is not time, and I recommend taking your time as well have a pen and paper to work with.
Be honest with them if you're willing to work year for this position, apparently you can transfer through DaVita through your course of career, however, it usually 6 months, only Credit Balance Specialist require a year.