Three reasons why the author's grandmother was disturbed when he started going to the city school.

Ans=
 The three reasons why the author's grandmother was disturbed when he started going to the city school are:

1. She was not in favour of western science and learning.
2. She hurt that there was no teaching about God and scriptures.
3. She was also not in favour of lessons in music. She thought it was not meant for decent and gentlefolk, but the monopoly of prostitutes and beggars.