Progesterone is a hormone released by the corpus luteum in the ovary. It plays important roles in the menstrual cycle and in maintaining the early stages of pregnancy. It may also be involved in the growth of certain cancers.
I've been following various people's posts about the GRE for 10 months now. Some people don't study at all for the GRE, some study for a weekend, the average is about 2 to 3 months, and some study for a year or more.
If you took the test in this time period, your scores are valid five years from the end of the testing year when you took the test. GRE testing years begin on July 1. This means that a test taken on May 15, 2015, remains valid until June 30, 2020.