Why did the headmaster summon Albert? What was the outcome? Answer in 100-125 words. (Chapter-Albert Einstein at School)

The headmaster summoned Albert in order to inform him that his work was terrible and that he could not tolerate him any longer in the school. So he had decided to expel him out of the school. When Albert was called by the headmaster he thought that he had been saved from the trouble of waiting outside the head's room for an hour or two. Although, Albert himself wanted to leave the school but he felt miserable because his medical certificate which he had earned with great troubles had became useless.