The majority of students take 9-12 hours per semester. I work full-time. Most, if not all, courses have an evening section, either on the main campus or at a satellite site. There is no limit on the number of times a student may take a test. Each test does have a prescribed time period before retaking a test.
Different tests appeal to the strengths of students.
The GRE uses a format similar to other standardized tests. The Miller consists of 100 analogies which must be completed within a 55 minute period. Students with a broad, liberal arts background often prefer this test. The Miller is given a few times a month on campus, the GRE once each semester. Non-degree status is granted to any student who has obtained a baccalaureate degree.