Dozens of New York Principals wrote to New York State Education Commissioner John King. 
“Even if these tests were assessing students’ performance on tasks aligned with the Common Core Standards, the testing sessions—two weeks of three consecutive days of 90-minute (and longer for some) periods—were unnecessarily long, requiring more stamina for a 10-year-old special education student than of a high school student taking an SAT exam. Yet, for some sections of the exams, the time was insufficient for the length of the test. When groups of parents, teachers and principals recently shared students’ experiences in their schools, especially during the ELA exams with misjudged timing expectations, we learned that frustration, despondency, and even crying were common reactions among students. The extremes were  unprecedented: vomiting, nosebleeds, suicidal ideation, and even hospitalization.”
Read the whole letter here:
http://www.washingtonpost.com/blogs/answer-sheet/wp/2013/05/23/ny-principals-why-new-common-core-tests-failed/