You mean the drills after each chapter, I assume.
I would suggest you skip the ones that test the things you already know well (how to divide fractions, roots etc.) and focus on harder chapters.
If you do problems and see that you are missing basic concepts go back and practice some more.
Math Foundations, also by Manhattan, is perfect for that matter.
"The Burnout" - My Debrief
Kudos if I helped you