DH and I are not all-consumed with DS getting good grades (although having All As in 4th, which he's capable of, would qualify him for a 4-year scholarship which would be nice but is not something we're going to put pressure on DS for).
Wait..what? Isn't that huge? And, if so, don't you think that could be a reason your child is having a little trouble with grades? They need to make it hard for kids to get all A's. So maybe they are extra picky about stiff, or tend to assign work that requires a level of attention to detail that is not usually required of children that age. Which wouldn't necessarily be bad or unreasonable, but you would want to be aware of it.
What kind of school is this?