The correct arrangement of the sentences above is:

Read the following sentences which are not put in good order.

Luciano also enrolled in teachers college.
He made him work very hard to develop his voice.
When Luciano Pavarotti was a boy, his father introduced him the wonder of songs.
His father advised him "if you try to sit on two chairs, you will fall between them. For life, you must choose one chair."
On graduating he was doubtfuk whether he would be a teacher or a singer.
Then Arrigo Pola, a professional singer took him as a student.

True answer:

3 - 5 - 6 - 2 - 1 - 4

The correct order of sentences is 3 - 5 - 6 - 2 - 1 - 4