I believe Birchas Shmuel has a ninth grade (Rabbi Wallerstien)avenue L and east 15th
yeshiva in five towns is Darchei Torah (Rabbi Bender)
Just btw “trouble learning” is a very vague statement: it could mean that the boy has slight learning disability, doesn’t have the means to sit through long shiur,or is just a boy whose learning skills are not so strong. I assume you are in brooklyn