Use the College Board's official publication to look up your PSAT percentiles and understand the Index.
Test Prep company Applerouth has a set of free online sessions in the fall. Check out the schedule. Realize that signing up means that you will be on their marketing list for paid test prep options.
Excellent summary of the purpose of the PSAT/ NMSQT, how it is structured, and how it is scored. Also section-by-section tips.
A full-length PSAT to take on paper. Khan Academy is the official partner of the College Board and provides free online test prep.
Khan Academy SAT Math Practice. The PSAT and SAT share the same Khan Academy test prep.
The Khan Academy is the official partner of the College Board. The PSAT and the SAT share the same free test prep.
The PSAT and SAT share the same Khan Academy test prep.
SAT Tips & Strategies from the Khan Academy. The SAT and PSAT are very similar & share the same test prep.
Excellent advice on analyzing your mistakes, considering possible resources for study, and tips for improving scores and taking the SAT.
PSAT on CollegeBoard.org.
Official practice tests from the College Board.
College Board page on scores. Includes a video about the score report.
Kaplan offers several free sessions organized by test section. Note that though this is free, you may be consenting to receiving emails and materials from Kaplan when you sign up.