Professor Snape's daughter was very affected in her grades so Snape decided to put Draco Malfoy as his tutor, they were the same age and Snape trusted him

"Well @ now, in this potion it would be better if you added... Are you listening to me?" asked a little angry "Look, I know you didn't want a tutor... But your dad asked me, and I know we don't get along very well, and I honestly don't know why, but please... The faster I pay attention faster we will finish"