MA has mandatory state testings. My year was the first year they tried it out on 4th graders (the first year it was implemented at all). Used to be 4, 8th, and 10th grade, and required for graduation. Now they stretch it out over most years from 4th and up.
I don't know what will happen with my brother, who is 15, and not in a regular high school, and has Down Syndrome. He's high functioning, but I don't think he could pass those tests.