There are lists of "reasonable accommodations" for students with different neurodiversities (I was looking for ADHD/Anxiety but there was also Autism and Dyslexia) that I looked at when we met with the school to discuss B's needs (having acknowledged that the previous SENCO had ignored her diagnosis and thus nothing had happened for two years...).

Of course, schools are used to these too and B's school is particularly good, so they had a list of suggestions and we had our own similar list. (Things that ended up being implemented: a pass to arrive to class after the rush, a place to take ten minutes out, a quieter place to eat lunch, fidget toys, and a discussion about how she does better with written instructions than verbal.)