Recycled SAT Question and SAT Vocabulary

<p>How often are the SAT Questions reused? I've read on another thread in this site, that this student forgot to review his answers in the 10 Real SATs book, and he saw the exact verbal section on the SAT. Do you think it was the truth.
The vocabulary list that Barrons and Kaplan provide are extremely long but is it necessary to know all those words, sure you will get a better advantage, but what about the SAT vocabulary words provided by Arco's SAT book and Barrons Verbal workbook, isn't the 500 frequently tested words efficient enough to get a 680+?</p>