the BA Prep course is new so it is undergoing change as it grows.
Without blowing up their spot too much I will tell you that academically you will have simple homework, and physically there will be progress tests... but the course is not designed to eliminate people, as a matter of fact you cannot quit. Do the homework and pass the PT tests and you'll be fine.
Take everything the course has to offer you, and simultaneously make sure that you are progress checking yourself on all of your cals/runs/swims so that when you get to your initial course, be it indoc/ccsc/tacp you are ready to blow the numbers away and be successful.