I think he has a great attitude too, and by my experience this is a common trait among people who learn a little more slowly but they prefer to go more deep into things.

I just took a systems test on the C750 and did not make 80% on it either, not even close. In my class of 4, three of us failed the part on C750 systems, but none of us has any jet time at all. The guy who passed was a college dropout who had thousand of hours in DC9s and more than a hundred SIC hours in the C750 itself, but couldn't work a basic weight and balance problem. He just knew what was going on and it clicked for him. Luckily since the other 4 of us weren't there for a type it didn't matter, but it was kind of interesting. I do not make excuses on this, I happen to know one girl who took the same test with no jet time at all and she passed with an 89%.