Please God DO NOT fork over any $$ for the Institutional Investor material. I did last year, and it was a total rip-off. No depth, limited question sets, twice the price of Schweser and triple the price of Uppermark. The typeface alone was about twice the size of Schweser, proving that II was trying to pad it out.
Get the Uppermark or Schweser material. I used both and both are well done. Again, big red flag to all of you guys: do not "use" the II stuff -- questions were stupid, answers were wrong, explanations wrong-headed, etc. etc. Clearly, the II powers dumped their Beta release on the market and were trading on their brand name. If you get this thing, you will be aghast that you have spent so much money on a couple of very thin books, whose explanations keep repeating themselves over and over in order to pad out even those few dumbed-down pages.