I'm new to database technologies and recently got sent by my company onto a Learning Tree course. It was very hard going and at the end I had to take an exam. Amazingly, I passed and now my company believes I am far more technically skilled than I really am. Don't know if this is the answer your looking for but my genuine performance was woefull, yet I passed the exam !
The exact same thing happend to me. That's why I was asking. I was on the C++ for Java and C programmers. It was the wrong course for me and I was really out of my depth. I couldn't believe it when I got the certificate through saying I'd passed! I thought maybe they'd made a mistake.