Had a good look round your website, and a couple of things have suprised me. You do your tuition on a lake, so I assume there's no "big water" tuition. Would you say that the majority of students go away with the neccessary skills to go offshore, and how do you learn if your unable to drive the boat?
I'm not criticising, just think that it's odd. We have numerous schools over in the UK, hundreds of them infact, to be certified you would need to show that your able to put all that you've been taught into practise. That is to say that in addition to a written exam, you also have to take a practical.