Nowadays, if you want to work on your vocabulary, just go to Free Rice!
But, back when I was studying for the GRE, I took practice quizzes by hand. With a math geek background, of course I was way more concerned with the vocabulary section, so, when i missed a word, or came across a word I wanted to remember, I wrote it and the definition in my 'lil black book.
I came across that book (dusty and ignored for years) and decided to push it to my digital ourchive. Instead of typing up the definitions, I've automated a link to dictionary.com. Here they are - words I don't know very well and/or words I wish I knew better:
Ha! I noticed that Abrogate is listed THREE times! I must really love that word. That, or it must really confuse me!