George Washington wasn’t able to attend school after the age of 11, because his father died and he had to take over running the family farm.
https://www.georgewashington.org/education.jsp
Despite being the Commander in Chief of the Continental Army during the Revolutionary War, the President of the Constitutional Convention, and the first President of the United States, George Washington’s level of education was far lower than any of the other Founding Fathers of the United States. In fact, he was often scorned by some of the other Founding Fathers for this inadequacy. However, this lack of education was not George Washington’s fault. Upon the death of George Washington’s father in 1743, George’s formal schooling ended. He is thought to have attended the nearby grammar school run by Reverend James Marye, the rector of St. George’s Parish, up until this time. Therefore, the extent of young George’s formal educational training was in basic mathematics, reading, and writing.
Although his older half-brothers had the opportunity to gain a formal education over in England at the Appleby School, George was required to take on the responsibility of running the family farm after his father’s death.
On this list, every ranking here places him as the highest-ranked President to ever serve other than one that places him at #2 and one that places him at #3:
https://en.wikipedia.org/wiki/Historical_rankings_of_presidents_of_the_United_States
You know Volodymyr Zelenskyy, current president of Ukraine?
He’s a comedian who did a political satire TV series about being president of Ukraine.
https://en.wikipedia.org/wiki/Volodymyr_Zelenskyy
EDIT: Darn, someone else apparently mentioned it as well, checking their link. I’m still gonna leave this text up, though.