I found the course useful as it taught the specifics of taking a history and physical of the kind that is required for the CS exam.
You won't have time to do a complete physical or a complete history and they emphasize on what to do and what not as well as give you valuable time with the patient actors who are well trained.
Most importantly, you will be taught in a group that will all be taking the exam on a similar date as you. After being taught at Kaplan, you'll be on the same page with them and this will make studying for the few weeks after the course easy with those students on FaceTime/Skype etc.
At the very least, do the 1 day Kaplan simulation test at their center to get a good idea of how the exam is done. They give detailed feedback and analysis of your weaknesses.
Alternatively, find someone who has taken the test AND someone who will take it around the same time as you and study together if that is possible.