Ah, bringing back some memories of Cody Hall at Keesler AFB where ATC is taught. Since I used to be in ATC maybe I can shed some light. You can't really be enough prepared to go to ATC school because if you do there might be a chance that you taught yourself something wrong and might forget to correct it. But I'll try and shed some light on the subject. The whole course is broken down into five blocks:
Block 1 - Intro to ATC
Block 2 - Intro to Tower (You start to learn "phraseology"
Block 3 (the most fun one to me) - Tower Simulation
Block 4 - Intro to RAPCON (Radar)
Block 5 - RAPCON Simulation
Which combined is 14 weeks and two days.
You can start learning about ATC and what you'll be studying by reading FAA Manual 7110.65M, otherwise known as the "Bible" of ATC. Every regulation and rule that applies to ATC is in the ".65". And since the FAA regulates "all airspace in the U.S." (even the military air space) the military follows the FAA regs & rules. You will be introduced to the
book
in Block 1. And use it throughout the course (especially in Block 5). Also, start to study the theory of "wake turbulence" because if you don't understand that concept it will haunt you and really hammer you in the Block 5.
The tower sim (Block 3) is fun. Alot of people either hate it or love it, what's funny is that the people that hate Block 3 love the RAPCON sim in Block 5. Alot of people will washout in Block 3, simply because they either don't want to continue and "find ways" to get out or they just really have a tough time understanding the concepts in ATC. And the instructors won't "baby" you either. If you have trouble during the course and score badly on either the written or the sim tests you will recieve "SIA" which stands for Single Individual Attention. All that is, is when everyone leaves at the end of the day you get to stay behind while the instructor explains it to you so you can understand it. If you get SIA alot and fail you block tests then the instructor puts your name up for elimination and you will be washedout.
Block 4 isn't really that hard aslong as you study and keep up with the work. Block 5 is the real killer. It's the Radar Sim (RAPCON). You will watch people drop like flies also. And the instructors will also do their best to "weed you out" and make your life a general hell. Block 5 is five weeks long so it's also not a short block. So if you have made it this far don't go out on the weekends all the time, study, it will be worth it because after this block and you have a 70% or higher you are awarded your three level. I was in ATC school and not CCT school so I only had to deal with the mental portion not the physical. Good luck, ACT/CCT are probably the hardest mental enlisted jobs in the Air Force, so it's no cake walk by any means. Good luck!