is summer school an option? i know some ymca’s do a summer school program in local schools. they might be worried he will lose his peer group. i was held back in first grade. but i started at a new school in a new town. my parents found a house they liked and we moved. so i didn’t have the embarrassment of being made fun of by my peers in second grade. i didn’t like being held back but my teacher was really really great. she got me back up to grade level. maybe ask if any of the teachers have experience with adhd education. if you hold him back and he gets a teacher who doesn’t care that will be horrible for him. maybe explore summer school or tutors before you make the decision to hold back.