Friday the 13th... the Orphan on AllMovie

This gory horror film is not related to the far more popular Friday the 13th from Sean S. Cunningham. In fact it came out before the latter. It is the tale of a 10-year-old boy who doesn't know the difference between a boarding school and an orphanage. The trouble begins when his aunt informs him that he will be going to the former. Mistaking it for the latter, he finds himself plagued by terrifying memories that turn him into a vengeful killer.