I'm teaching summer school as part of my Master's program and I'm sort of facing a similar situation. There are three students in my classes who appear to have some sort of special needs that are affecting their performance in the classroom. I have been talking with the others to find out if it is across the classes, and it's sad that we can't get any support at the moment to help these students. There is one who needs constant one on one attention, which is only possible because all master's students are in the room with mentor teachers.
Due to my sped background I was able to pick up on some of these problems right away and we are trying to remediate them, but we have no resources since it is summer school. I don't even know if these kids have been identified and qualified for or received services when they were in elementary school. It is frustrating because I really feel that they are not understanding the curriculum but our resources for modifications are very limited and they would be served better by a different curriculum in a smaller class setting for reading instruction.