Many times administrators don't get it. If administrators won't listen, take a group of parents to meet with them. It really helps to know which approach to use with all your students. You may also discover your teaching style in the process since it is based on your learning style. So give a pop quiz that is below their level at the beginning of each day so they can at least have a positive jump start.
Some teachers use carrels around the student's desk to help block out too much stimulation.
Other teachers have a desk located in the back or side of the room for the student to go to. It is important that whatever the set-up is, it should not be perceived by the student as punitive.