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 he got so badly injured that when he was shot down the thought he was dead. his injures were burns i think after getting to the hospital it was know he could not open his eyes or talk