Setting up the room:  I teach resource and this past year I had a student who spent about 4 hours of her day in my room.  She is autistic so I set up one corner of my room like one of the Communication Behavior Social Skills classes in our school district.  It made a big difference in her ability to focus on instruction and complete tasks.  There was a pocket chart on the wall near her desk for her daily schedule.  It was her job to put up the parts of her day in order. Then we'd review what was coming up each day.  Most of it was the same except for which specials class she had or if she had speech or OT.  On the bookshelf near her desk there is a basket for work to do and one for finished work.  On the shelf below that I kept all the tasks she needed to do throughout the day/week.  I only put the work she needed to complete in one sitting in the "Work to Do" side.  Keeping all of her materials organized and having the room blocked off so that other students were not in view was so helpful.  The noise from other students coming in and out of the room and working in small groups was still a big distraction but the room set up decreased the amount of times this student needed to be redirected.