Unfortunately this was not an exaggerated story as that's how matters were resolved back in those days and corporal punishment was the way they educated kids.
It's true and I had seen it when I was in school. Besides, when I was a class 1-2 student, our teacher often used to punish us with wooden ruler scales on our hands. Our parents never complained instead they supported it thinking it's the best medicine for a naughty student who doesn't do homework or can't perform well in class.
I was a backbencher student so these punishments were common to me...