For the letter that was sent home with your child in September 2016 about this administration, use the link above.
The PSAT is "a preliminary version of the SAT," an exam students take before attending college. More information is available all over the internet. One brief explanation that may prove helpful is available here.
GMAS (Georgia Milestones AssessmentMilestones End of Grade (EOG)
Milestones End of Grade tests are administered to all students in April; EOGs assist to gauge student progress through the grade level.