The general tryouts are usually nothing but a formality where the coaches say no. If he wants to walk on at most P5's, he needs to be recruited as a walk on. I would send them video and let them know that you want to walk on. If you have a Summer coach, have him reach out for you. If the school is having a camp before the start of next season, attend it and let them know you want to walk on. A lot of schools bring in 45-50 for the Fall, so there will be more players than spots.