When you have finished your Twinkles:
I Can Read Music (ages 3-6 get volume 1, 7+ get volume 2, adults don’t need this book)

When you are in Book 2:
Double Stops for Cello
Position Pieces for Cello, Book 1
Improve Your Sight Reading, grades 1-3

When you are in Book 3:
Canons and Rounds (for cello ensemble)
Improve Your Sight Reading, grades 4-5

When you are in Book 4:
Ensembles for Cello
Book 1
Book 2
Book 3
Book 4
Scaling the Tenor Clef Dragon (up to age 8) or Learning the Tenor Clef (older students and adults)
Position Pieces for Cello, Book 2
Thumb Position for Cello