@hja379 - Regarding your question on how GMATPill would be helpful if you've already learned concepts elsewhere.
Well, you'll learn how to approach questions more efficiently--we try to help you answer the question in as little time as possible so you can move on to the next one and not get penalized for not finishing the exam.
You'll find a new way of thinking---it is possible to answer questions confidently without even looking at all the answer choices. There are many cases where you don't even read the entire answer choice--just scanning down each answer choice and focusing on keywords can eliminate time and also reduce the amount of material you need to process through your head.
In short, if you feel you could benefit from a new perspective that may be more efficient and easier to understand than the way you are currently going through questions--then it may be worth a shot.
Oftentimes these subtle differences are the difference between a good score and a great score.
To better assist you in making this decision, please look at the
many free videos on our site to get a sense of how it might help you.
@Nightreader--the pill is as close to real medicine as you can get--with dangerous side effects worth noting:
1) increased confidence on the day of the exam
2) increased speed, alertness, and accuracy when plowing through GMAT questions ;]