This is a huge pet peeve for me. Children with special needs who can take the test, should take the test. However, passing shouldn't be the only goal. They should use the tests to see how far the students have progressed and how close/far they are to performing at grade level. They should use it as a way of identifying the students who are "almost there" and figuring out ways to help them get the rest of the way. They should take the test, but shouldn't be part of the pass/fail equation.
It's such a complicated topic. Having the children with special needs take the tests forces the schools to raise the bar on the education they're offering these students. DS has special needs, but only performs about 1 year behind in certain academic areas. He's ahead of his twin in others. I've had to fight for him to be given the opportunity to learn everything that his twin learns. Basic accommodation requests have been met with threats of putting him in a self-contained class (here the only self-contained classes are skills classes). I've been to a special ed. parents meeting where the superintendent told a group of us that the majority of our kids wouldn't go to college. My child is 9 years old and he's, at this point, just as likely to go to college as his twin sister is. He has many strengths and a few specific weaknesses, but we don't know what his ultimate limitations are and we need to give him the information he needs to succeed in life.
I truly hate all this testing, but prior to it being mandated, special needs students who were possibly capable of learning grade level material were often given an inferior education.