The great thing about common core is the disappearance of multiple-choice tests. Anyone who grew up outside the US will tell you that having to show your reasoning is much superior to picking between ABC and D.
When discussing the multiple choice format between students, we've always thought that it's way easier to get the guess the right answer between choices than to show how you got there.
It's even worse outside of math classes, say history, and you're asked "when did $COUNTRY get its independence", obviously, it's much easier when you have a list of choices to choose from.