Is the movie To sir with love a true story?

The movie "To Sir, with Love" is loosely based on the real life experiences of author E. R. Braithwaite. The book of the same name was based on his time as a teacher at a tough inner-city school in London in the 1950s. However, the movie took certain liberties with the actual events and characters, and is considered a work of fiction rather than a true story.