You see, when the impulsivity and hyperactivity is accommodated, it tends to diminish with such accommodations. Build a quiet corner. A soft rug, some beanbag chairs, make-due foam pillows in a back corner offers a more natural setting for leisure reading. Study carrels offer privacy and personal space when needed. Carrels can be placed against the back wall or folding individual carrels can be constructed of hardboard and placed on the student's desk.
Student can decorate as desired.
ADHD students may perform better when seated near the teacher and where visual distractions are reduced. Others are so self-conscious when seated up front, it actually diminishes their performance. This has to be an individual call. Have an escape hatch for this child. Children with ADHD don't filter incoming information as most people do.