How is Mr Crocker Harris different from the other teachers??

Below are the points that may help you construct your answer:

1. Crocker-Harris is a teacher who would not compromise on the rules and regulations to suffice sentiments of students.
2. He is hard on students when it comes to studies.
3. He is a teacher that a student could never disobey. They respect him out of fear. 
4. He possesses an indifferent and non-understanding attitude towards students. 
5. Other teachers like Frank envied him for the effect he had on the students as all the students seemed too scared of him.