I also start 10 year olds in the Accelerated Piano Adventures Course. I use all 4 books: Lesson, Technique, Performance, & Theory. To supplement the method, I use the PreTime-PlayTime books (for Book 1), the ShowTime-ChordTime books (for Book 2), & the Acc. Popular Repertoire books.
At age 10, I think the child needs to move a little faster than a 7 year old. I do move slower if the student needs to, though, and only do 1/2 the assignment (Technique & Lesson) one week and the other 1/2 (performance, theory) the next week.