Of course, it is very difficult to know how to conclude a paper when we cannot see all the information you are including or the conclusions you have drawn from your data.
However, if I were writing this conclusion, I would say something like this:
All students, but particularly those from poorer backgrounds, face a number of challenges in achieving their full potential in schools. In the case of poorer children, they may well have a homelife or family situation that is not conducive to doing well in school. In addition, they may face some amount of unconscious prejudice on the part of teachers. Because of these factors, lower class students will often find it more difficult to succeed in school.