He had developed a crush on his teacher Miss Flint, but was heart broken when he learned that she was engaged to a stockbroker.This made William believe that the only way to attract a beautiful woman was with money. On the day he learned that Miss Flint was going to be married, Vic and his friends trashed William's work and beat him up.In high school, Baker became a football star and began dating a cheerleader named Marcy.
After beating up Vic, he went on a crime spree that led to yet another incarceration.
Sent to Ryker's Island, Flint eventually broke out of prison, causing the manhunt that led to him getting his powers.
Apparently the Sandman either previously or later began dating one of the teacher at Midtown High, and returned again to try and get her to come with him while he was on the run from the law.
Peter Parker once again slipped out of class to become Spider-Man and battled Marko once again.
This time around Marko was defeated when Spider-Man turned on the fire sprinklers then fused him into a solid sand form with the electrical power from a Stark Industries energy generator that was being demonstrated for a science class.