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.
ETS keeps your scores on file for a period of five years following the date you took the test. If you take the GRE on August 1, 2012, you can request a copy of your score up until 2017. According to US News, the scores on your GRE are one of the six factors that graduate schools look at in regards to applicants.