Is there a school where I can send my son to toilet train him?

Never heard of any. Of the many frustrating jobs of parents, toilet training leads the list. I have know some day care centers that would assist parents & follow their approach to training. However, the responsibility falls upon the parents, aided by suggestions from their pediatrician.A variety off publications describe several approaches & you should be able to find one that fits your needs.
Home School! Yes, you can really do this yourself. Take some time and be persistent. Try potty training boot camp - one of my professional favorites!