Words memorizing... please read this post:
http://www.TestMagic.com/forum/topic.asp?TOPIC_ID=10026
I myself have been struggling just like you, one method that I prefer is to make a group of words that has similar meaning. It eased (well... a little bit) the pain. We don't have to know the exact meaning, but at least when we're confronted with analogy or antonym questions we know the similar meaning.
Hope it helps.
Cheers,
Zulfikar Dharmawan