The study guides they have set them on a pretty intense course, taking up a lot of their free time - especially when they dip into some NEWT Defense points, ranging from spells to magical creature knowledge to prepare Ellie for the Third Task. Anathema has them using the Chamber of Secrets for a lot of the training - no one will interrupt or spy on them down here, after all, and then they can spend time with Gormlaith (who is often - and increasingly - agitated, but the basilisk can never articulate exactly why, and nothing seems strange to the girls when they look around).
They're allowed to sit their OWLs with the fifth years, and even get special permission to also sit the exam for the other's magical elective despite never having taken the class. The exams are much harder than their end of year tests have been so far, and they won't get results back until summer break, but they both feel pretty confident.
And then there's a week after OWLs before the Third Task, which seems to be approaching surrealy fast - a week isn't long to learn a new spell, and Professor Reynolds ends up insisting on spending most of that week dueling Ellie, quizzing her during rest periods. The day before, Professor Reynolds suggests Ellie rest and empty her mind - focus on mediating, get herself calm and centered - and she suggests spending the day of the Task in light activity, mostly stretching and walking.
The Third Task itself starts after dinner at sunset. Ellie will be entering first, an entire sixteen minutes before Victor Krum - the Cedric Diggory two minutes after him, followed by Elodie Delacour another two minutes later. The maze is huge, and their goal is to reach the Triwizard Cup at the center and be the first to touch it. They're allowed to duel each other if they encounter each other in the maze. There's no time limit, but the tournament ends when the cup is claimed.