Why are blacks asians and everyone else doing better in school than whites?

Several things come to mind, it's going to depend on the generation you speak of, as well. Years ago, many people, black and white, didn't get the same amount of formal education as we do today.

Then, unfortunately, in some school systems, you had the whole "don't fail the black kids or you'll be called a racist" thing, so, even if you had students who weren't doing the work or making the grades, they got passed, just to not have a high black failure rate.