I can't imagine these exams are in any state of flux. Technically, the 70-342 exam was just released in January, 2013. It's a new exam!
It appears that you have limited study resources available. No practice exams, no study books - just a few Exchange 2013 books and half of them have very poor reviews.
First off, be sure to look up the exam topics on the primary documentation site here:
TechNet Exchange 2013 documentation:
http://technet.microsoft.com/en-US/exchange/fp179701
For the 20342B course - it is a real course that is delivered by MCTs (such as myself). The course aligns very closely to the exam outline.
Here's a tip - even if you don't take the class, you can still download the course's companion content from Microsoft download site here:
http://download.microsoft.com/download/D/1/B/D1B1FA39-3F06-4F55-974E-796E1EA1E00C/20342B-ENU-Companion.zip
It includes review questions/answers and course take-away facts.
You can always brute force your way through the exam and pass it on a second attempt after learning what is on it during the first attempt.
Good luck!
Best wishes, Davin Mickelson
