Mmmm, your thinking is not far off, but at the end of a course i ask myself the question, would a let them leave with my boat
? If the answer is NO, then i can't give them there certificat.
Also not every one learns the same.
Yes the school should be good and i consider myself a pretty good instructor but i have not seen many student who would qualify to charter
a boat after the basic keelboat 101 course.
Also to get into other course you do have to have prerequisites of at least 80 hours of sailing time.
And lastly, i would not get into a plane with a pilot fresh out of a 2 weeks fast track course. No way!. Get some hours under your belt.