He didn't. He retired from a long career at about that age and went home to be with his wife and daughters. He couldn't go to school even if he wanted to be.
As there was no such thing as "high school" back in Shakespeare's time, it is certain that he did not "graduate". However, Shakespeare did attend Stratford grammar school from the time when he was 6 or 7 until 13. His father pulled him out of school at age 13. Yet that isn't to say that Shakespeare was later self taught and learned by other means.
Shakespeare went to the Stratford Grammar School (called King Edward VI School nowadays, then called the King's New School) at around age 6 or 7. There may have been some rudimentary instruction in letters, divinity etc. at a "Dame School", a kind of home school run by local women.
Forty Hour Train Back to Penn was created in 2003.
A back forty is a remote part of a farm, or, idiomatically, the most remote or inaccessible part of somewhere.
The cast of The Back Forty - 2013 includes: Gary Huculak as Charlie
Shakespeare learned the basic subjects that were taught during his life time. It's likely that he could read Latin by age 8, as was expected back then.
We have no specific knowledge of Shakespeare's early life, so we can only guess that it was a typical childhood. He did go to school, obviously, and is thought to have attended the only available local grammar school. School was much harder back then: the days were long and the students had to work hard or be beaten by their teachers.
simply red: holding back the years
Frank gore
Eighty months. That's six years, eight months and that's just the principal.
None of Shakespeare's friends is as famous as he is. Back then, though, his friend Richard Burbage was much more famous than Shakespeare was.
Oh, dude, Shakespeare probably wished he could sleep in until noon like the rest of us, but yeah, back in the day, school hours were pretty brutal. I mean, can you imagine trying to stay awake for 12 hours straight learning about iambic pentameter and stuff? Like, talk about a Shakespearean tragedy.