SAT+Prep-Vocab+Practice

http://www.vocabulary.com/
 * ===Vocabulary Practice Sites===

http://www.vocabahead.com/

http://www.wordia.com/

http://wordstash.com/

http://www.knoword.org/

https://market.android.com/details?id=com.socratica.mobile.words

http://www.myvocabulary.com/