The first person on record to assign grades to school work. It was in 1792. it was at Cambridge University. Neil Postman, quotes Keith Hoskin about Farrish :

"Farish was a professor of Engineering at Cambridge and installed a movable partition wall in his Cambridge home. The wall moved on pulleys between the downstairs and upstairs. One night, while working late downstairs and feeling cold, Farish pulled down the partition. This is not much of a story, and history fails to disclose what happened next. All of which shows how little is known of William Farish."

History of Education vol VIII, no.2