Teen DD is ahead in math. She was very bored as a kid in elementary, so we did Art of Problem Solving, which for that age group is called Beast Academy. She loved the little monsters and the stories! Then she was placed into the MCPS CES math track for 4th and 5th, then tested into Algebra 1 in 6th grade and is now in Honors Precalc in 9th grade. Will take AP Calc BC in 10th and then various other math classes. She hasn't needed any math tutoring yet, but as her math track progresses, we're not ruling it out. My father is a research biostatistician, and is ready to help if she needs it.
Certain school systems require a math class every year of high school (and indeed, it does look better for college admissions), so one consideration in all this is what to do if a kid has reached the end of their math track at their school yet still needs to fulfill a math requirement. MCPS provides dual enrollment courses with Montgomery College and we know one kid who went to UMD as a high school senior for an advanced math class, so there are options... but it's an added wrinkle.
I have to add that our other child, currently majoring in a Humanities degree in college, is not mathy at all. He needed a math tutor for AP Calc BC, which was the end of his high school math track. I am of a similar disposition, despite being a research biologist. I use a little math for work... but I don't like it
