Took my first (and last) attempt this morning and ended up with a 65 9/9/9.
I don't know how much I'll be able to add to the gouge, but I figured I would share my test experiences at the very least.
MST
I got a ton (4-5) questions on probability, which was certainly more than I expected. Most of it was pretty straightforwards, but there was a bit involving the probability of multiple events and multiplying probabilities of disjoint and non disjoint events.
I also got questions about binary and how to write a certain number in a base 2 or base 4 code, I hadn't had any prior exposure to binary but was able to reason it out through the information given in the question, but I'd say the majority of my questions were word problems involving some sort of related rates or intersecting times, generally involving using d=rt.
In general, the MST was much more difficult than I anticipated, math has never been my strongest area, and I found the questions more difficult than those in Barron's book as well as the Marine gouge posted on this site.
I finished 12-15 questions and was kicked out with around 16 minutes remaining.
RCT
I found the passages pretty difficult and confusing at a first glance, but was able to answer most questions using a process of elimination. Remember to answer based off of what is given and don't draw on any outside information. Most of the passages were Navy related (dry), nothing super exciting.
MCT
About as expected based off of Barron's book and the gouge, almost all questions were purely conceptual, any math was straightforwards and simple. However, there were some strange questions involving how microwave ovens work, what G's are defined as, how pitots work, and a couple of pulley questions.
ANIT
As expected, but I studied a lot for this section. Difficult questions (for me) involved the Naval Air Forces chain of command, VFR regulations, and how different grades of aircraft fuel affect engine performance.
NAFTI
Today I learned that I'm a terrible person.
PBM
Hard.
I used the compass trick for the UAV, missed 2 and averaged 1-1.5 seconds. The dichotic listening was easy by itself, but the aircraft tracking was difficult, I felt like I was tracking <10% of the time and my joystick came unplugged at one point during the test, but I guess it worked out.
Write down the emergency procedures!
All in all, I studied around 8 weeks for the test, averaging 10 hours per week. As far as books go, I used Barron's 4th edition which I found useful, along with NAVEDTRA 14014 and the FAA Pilot's handbook for the ANIT, but the most useful study materials in my opinion are the various gouges posted in this thread, (Marine gouge, apatrick's guide, ect.) for which I can't thank you all enough.
Good luck to all future test takers, and feel free to send me a PM with any questions or if you'd like my full list of study materials.