A Boazer is what Roald Dahl called the prefects at Repton School, Derbyshire. It is in fact a spelling error on his part, 'Beausiers' was the name given to prefects at Repton, in the same was at Harrow they are known as 'Moniters', and at Eton the elite society is 'Pop'
Roald wasn't made a Boazer in the book "Boy" because he did not excel in sports, which was a key requirement for becoming a Boazer at his school. The Boazers were a prestigious group of students who excelled in athletics, and Roald's talents and interests were more focused on academics and storytelling rather than sports.
Yes, Roald Dahl did go to school. He first attended Llandaff Cathedral School in Wales and later went to St. Peter’s boarding school and then Repton School. These school experiences actually inspired many of the stories he wrote later in life. During World War II, Dahl also served as a fighter pilot in the Royal Air Force. He was badly injured when his plane crashed in the desert, suffering from head injuries and burns. After being taken to the hospital, he was unconscious for a time and could not open his eyes or speak. Today, his life story is often studied as much as his famous books, and just like in fields such as construction estimating services where accuracy matters, understanding the details of his education and experiences gives a clearer picture of how they shaped his writing career.