The "Most Difficult First" strategy often helps to keep gifted and talented learners engaged and not feel "burnt out" with mindless work.

This strategy includes identifying the most challenging problems of the students' work (about 3 to 5 problems) and starring them.  Then, you would offer to the students that if they are able to successfully answer these hardest questions first, without getting any wrong or making any mistakes, then they would not need to complete the whole problem set.  

The "Most Difficult First" strategy helps gifted learners to not become disengaged or frustrated by the fact that they are completing more work that they do not need or already know.  Instead, after they have shown that they have mastered those concepts, they can use their extra time to push themselves further or complete other learning activities in your classroom.  

*Remember that the needs of gifted students can vary widely, and it's essential to adapt your approach based on their individual strengths, interests, and areas for growth.