After what seems like ages, the final exam - [History of Magic] - begins. Harry struggles to concentrate, and then even to stay awake, and when he finally does fall asleep he sees a vision of Sirius, trapped in the [Department of Mysteries], being tortured by Death Eaters. He wakes up screaming and falls on the floor of the [Great Hall], his [scar] in agony.
The first week of [O.W.L.s] continues and passes, with Harry confident he's done fairly well in [Transfiguration] and [Herbology], and supremely confident in his [Defence Agaist the Dark Arts] exam. Finally, on Friday, Ron and Harry relax while Hermione takes [Ancient Runes], and they all agree it's time for a break.
Hermione returns from her [Ancient Runes] [O.W.L.] upset because she got a question wrong, and because another [niffler] has been snuck into [Umbridge's office].
[O.W.L.s] continue for a second week, with Harry feeling fairly good about his performance in [Potions], in [Care of Magical Creatures], and in his [Astronomy] written exam, but miserably poor in [Divination] - which, as Ron points out, was to be expected.
Hagrid is Attacked
The fifth years climb the [Astronomy Tower] for their nighttime [Astronomy] practical [O.W.L.] However, as the exam progresses, Harry notices [Umbridge] sneaking up on Hagrid with a team of [Aurors], attacking him and driving him away as he fights back - and when McGonagall storms out to intervene, [Stunning] her as well.
Chapter 32 - "Out of the Fire" - In which Ron, Hermione, Neville, and Luna help Harry break into Umbridge's office, Kreacher leads Harry to believe that Sirius is at the Department of Mysteries, and Hermione tricks Umbridge into taking her and Harry into the Forbidden Forest.