Back when I was preparing for the GRE (in the early 90's), I found two things to be very useful for increasing vocabulary. 1) Anu Garg's "A Word A Day" (wordsm

Back when I was preparing for the GRE (in the early 90's), I found two things to be very useful for increasing vocabulary. 1) Anu Garg's "A Word A Day" (wordsmith.org), back then it was just a daily email subscription that emailed out an advanced vocabulary word. One per day, simple and effective back in th'day when people received a volume of email that was actually consumable in one day. 2) A buddy passed on to me a huge stack of index cards each one containing a turgid vocabulary word that you would never use in real life but that would be common on the GRE or in a George Will essay. I recall that when I took the GRE, there were a couple of words that I would not have known if I had not prepared with the cards and at least one that was on a word a day. A few words is enough to seriously boost your GRE score and totally worth the small investment in time (a few minutes everyday for ~6 months).