Complete Confusion

As I posted earlier I had been having trouble with my sixth grade classes. The class had just finished a lesson on taking care of teeth and skin so I decided to give the class a test. My first sixth grade class went great, but my second sixth grade class was total confusion. I passes out the tests and everything was going so well, but I did what I thought I should do and everything went down hill. I have a non verbal child in the second sixth grade class that I have to do modifications for. Well I modified a test for the child and placed it on his desk and began to explain what to do. As I did this the child began to scream so loud the teacher next door came in and checked on me. When the child started screaming the whole class was distracted and got off task. I tried to get the class quiet to finish the test, but the child kept getting loud, distracting the class so the principal had to come down to my room to help make the child calm down. Although the end of the lesson test was total confusion  there was a great success story.