This year, I made two big changes to Maestro's Challenges. The first is that I separated the Musician Survival Skills Challenges and the Music Moxie Challenges. The biggest change, however, is how my students and I are approaching technique. It's been a bit of a gamble, especially with the ones preparing for an exam, but it's paying off.
Try as I might, some students just loathe practicing their technical exercises. You know the ones - scales, chords and arpeggios. I must admit that when I was their age, I wasn't too keen on practicing them either. However, if you want to "level up" and/or ace this portion of your music examination, you can't get away from it. You have to practice them. A lot.
If I have to ask my students to play a scale more than once in a lesson, I ask my them to play to play it differently. For instance, if a student played it legato the first time, they could play it staccato the second time.
But why stop there? Change the rhythm and make it sound like a real tune. Zig-zag back and forth so it doesn't sound like a scale. Change where you place the accents so that it's on every fifth note instead of every second or third.
The bottom line is that some degree of repetition is needed, so why not make it interesting for yourself?