Test #1 - Get the Professional Series
Reading through the Professional Series Books was so helpful.
As mentioned - the questions are not based on learning the definitions of the word - but ask - what is the MOST or LEAST likely answer based on these criteria.
Take time to prepare and read, read, read....
I read the Professional Series and Study Guides - then took the diagnostic tests.
Some of the real test material was similar to the diagnostic practice test- only more in depth.