I wouldn't worry too much about how it's graded. In my class, and classes before me, there were always enough students in the 90's to not really change the number of A's. But the distribution was scewed by the overacheivers, so the lower grades tended to be curved even though the higher grades were'nt (for example, a typical curve was A (90-100), B (75-90), C (60-75), D (40-60), etc. So, getting an A would probably require being in the 90's anyway. But, getting a B might be a little harder than your average B distribution.
And yeah, it's hard to write orgo tests as multiple choice. My tests were all conceptual questions, giving products, intermediates, reagents, etc. for a given reaction, syntheses, and mechanisms.