Learning to Apparate
Harry Potter and the Half-Blood PrinceThe sixth-year students take Apparition lessons, with Ron struggling and eventually passing, while Harry cannot take the test due to age.
increasing
Bearing strength in each event
decreasing
The First Lesson

The Introduction
The Instructor
Wilkie Twycross, a Ministry Apparition instructor, begins lessons in the Great Hall. He teaches the three D's: Destination, Determination, Deliberation.
The Practice
Students attempt to Apparate into hoops. Most fail, and some splinch themselves. Susan Bones loses her leg temporarily.
The Frustration
Ron Weasley struggles with the technique. He becomes frustrated, especially when Hermione succeeds easily.
The Extra Practice

The Improvement
The Opportunity
Students who are seventeen can take extra practice sessions in Hogsmeade. Ron signs up, hoping to improve.
The Success
Ron manages to Apparate, though imperfectly. He gains confidence.
The Test
Ron takes the Apparition test but fails because he leaves half an eyebrow behind. He is disappointed but determined to try again.
The Test Day

The Outcome
Hermione's Success
Hermione passes the Apparition test with flying colors. She is delighted.
Ron's Failure
Ron fails due to a minor error. He is grumpy but vows to try again with Harry.
Harry's Ineligibility
Harry is not yet seventeen, so he cannot take the test. He is philosophical about it, as he plans to leave school anyway.
early February, first Apparition lesson
March, additional sessions in Hogsmeade
late March, the day of the test