Hi FF,
You will be send a Study Guide to prepare. In this guide you will find SOP's and Checklists. Study these. Refresh your basic IFR skills; holding interceptions, radial interception and tracking, and ILS approaches. Vital for a good start is to know from memory: Power settings and Pitch attitudes for the different speeds and configurations (provided in the guide).
It is not correct that if you do reasonable in the grading, you don't do the AHC. A bigger part of "initials"(i.e. non-jet) is put through the AHC, to achieve the true goal of the program: give you as a non-jet operator the chance to get used to the speed of information processing you will have to "learn" to fly these machines in a compact Type Course, and not another "check". You are assumed to have the right balance of airmanship and motivation, having come this far and invested a sizable amount of time and money in your career.
Not much people fail this course. Only if you come unprepared and unmotivated, you will have a tough 4 days. Good luck and enjoy.
Regards,
CS