http://www.vocabulary.co.il/psat_vocabulary.html
Has free vocabulary games students can use to practice for the PSAT http://www.majortests.com/word-lists/
A free list of lists http://www.proprofs.com/flashcards/story.php?title=PSAT-1
Free flashcards http://www.majortests.com/
Free practice tests and word lists http://www.fastweb.com/college-search/articles/745-last-minute-psat-prep
Last minute PSAT/SAT Prep tips http://www.studyhall.com/firstime1.html
A great study skills website, including SAT prep https://www.msu.edu/~defores1/gre/roots/gre_rts_afx2.htm
Greek and Latin root words http://www.awrsd.org/oak/Library/greek_and_latin_root_words.htm
More Greek and Latin root words—this one has a nice list of prefixes and suffixes http://www.wordinfo.info/words/index/info/view_unit/3329/?letter=V&spage=5
This one has fun vocab quizzes with words from Latin and Greek origins http://www.factmonster.com/ipka/A0907017.html
Fact Monster—looked at this for vocab but it is a great website for a lot of educational topics. It has current events, maps, etc.