Remind me, this report shows PSAT scores for both sophomores and juniors, do kids normally take the PSAT in 10th or 11th grade?
Yes. The 11th grade scores are the one used for National Merit scholarships. Quoting the Wikipedia:
"The Preliminary SAT/National Merit Scholarship Qualifying Test (PSAT/NMSQT) is a standardized test administered by the College Board and National Merit Scholarship Corporation (NMSC) in the United States. This test is offered by the College Board. Approximately 3.5 million students take the PSAT/NMSQT each year.[1] In 2008, 1.59 million high school sophomores and 1.52 million high school juniors took the PSAT.[2] Some freshmen, eighth, and seventh graders also take the test. The scores from the PSAT/NMSQT are used (with the permission of the student) to determine eligibility and qualification for the National Merit Scholarship Program."
