The course will not be hard. So don’t fret about that aspect.. other than the cost!
As for the pass mark. No idea about the pass mark required on the course, if indeed there is one or is it just attendance? Anyone?
I am aware that the on-line test (via Atlas Interactive) for those already working offshore, requires a 100% pass, so the system keeps re-tutoring/re-testing until you achieve 100% pass and then links the pass to your Vantage number. OPITO will then have you on record as being MIST compliant which any future employer can check if required.