Harry's euphoria at finally winning the Quidditch Cup lasted at least a week. Even the weather seemed to be celebrating; as June approached, the days became cloudless and sultry, and all anybody felt like doing was strolling onto the grounds and flopping down on the grass with several pints of iced pumpkin juice, perhaps playing a casual game of Gobstones or watching the giant squid propel itself dreamily across the surface of the lake.

 But they couldn't. Exams were nearly upon them, and instead of lazing around outside, the students were forced to remain inside the castle, trying to bully their brains into concentrating while enticing wafts of summer air drifted in through the windows. Even Fred and George Weasley had been spotted working; they were about to take their O.W.L.s (Ordinary Wizarding Levels). Percy was getting ready to take his N.E.W.T.s (Nastily Exhausting Wizarding Tests), the highest qualification Hogwarts offered. As Percy hoped to enter the Ministry of Magic, he needed top grades. He was becoming increasingly edgy, and gave very severe punishments to anybody who disturbed the quiet of the common room in the evenings. In fact, the only person who seemed more anxious than Percy was Hermione. 

Harry and Ron had given up asking her how she was managing to attend several classes at once, but they couldn't restrain themselves when they saw the exam schedule she had drawn up for herself. The first column read: 

Monday 9 o'clock, 

Arithmancy 9 o'clock, 

Transfiguration

 Lunch