I wish I had experience in this. I would enjoy having High School students working with elementary students before they enter my Middle School classroom. I, however, have seen High School and Middle School students mentoring Elementary students in reading. They listen as the younger children read and help with difficult words. It is even more powerful when the older student reads aloud to the younger student. I say "GO FOR IT!" Please share your experiences with us so we can learn your challenges and successes.