The AAMC self-assessment is better in my opinion than EK Verbal 101. I'd start with the SA and if you need to, go to EK. If you have the time, I'd recommend supplementing your studying with a free option such as NYtimes opinion columns ( try not to read the titles - that's sometimes very hard!). This is a somewhat untraditional approach and you will only get out what you put into it, but it will help you with speed and reading comprehension (which is half the battle) if done right.
Good luck!