We also have started playing classical music in the background (thanks to my sis-in-law, Jaime who set it ALL up for me!! You're the BEST!). This seems to really help my middle child focus better. She has a very hard time concentrating and focusing. I read this tip somewhere else and I started implementing it into our school a little while ago.
This is Morgan - My 1st born, rule-follower (actually DOES sit at the desk)