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Personally the roots have never helped me at all, as it tends to be that they lack usefulness in many cases (de- is often depicted as "down" or something negative, not the case for "delighted" as you may know.)
Believe it or not, studying flash cards is probably one of the best ways to improve your vocabulary quickly if you've never read anything more difficult than Roll of Thunder Hear My Cry. Remember that you have to study ALOT of them, literally from the start to end of Kaplans '09 glossary. I remember taking the test and something like 20 of the synonyms were from the words I studied (4 more that I naturally knew).
Studying roots doesn't hurt, but know that they can be misleading from time to time.
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