@leftcoasthope thank you - this is new to me, I’ll take a look!
I’ll second this. I’ve taken algebra 1 and 2 through CTD (CTY’s Midwest partner program - through northwestern university).
We like CTY classes generally. You won’t find anything labeled 8th grade math though. I believe their progression is 6th to honors pre-algebra. It is accredited and can be graded. That particular course had content that was not in my kids in person honors algebra classes. You can also select the length of the course. I selected the shortest (and cheapest) length and it was a very fast pace. CTY is one of the few sources that offers financial aid and although we do not qualify, I prefer to give my support to a group that offers it.
AOPS also has an excellent reputation.
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I’ve seen CTY mentioned several times - is that the online course, or the in-person 3-week camps in the summer? I assume it’s the online courses that we can take throughout the school year?
I was suggesting online for OP. We asked if DS could do this in lieu of school math (with us paying) and they said no. Another school might have been more accommodating.
The in person summer camps are a lot of fun. But I was talking about the online classes which can taken completely independently (overseen by instructor) or with a group (also overseen by instructor).
You can use various scores to qualify or take their online SCAT test depending on age.
For advancement/on-line classes through the school year, it would be CTY’s on-line offerings. They have session-based and self-paced courses through Complex Analysis.
The summer courses are mostly enrichment/alternate topics (my D took Probability and Game Theory). It looks like they dropped the fast-paced math that was held along with the fast-paced science courses (unless I’m remembering incorrectly).
(But the summer program is also great - my introverted D was thrilled to be among people “like her” and was elected to one of the Passionfruit leadership roles.)
Side note - for those looking past Calc, AoPS has resurrected Group Theory:
“We assume fluency with modular arithmetic, the complex numbers, and basic combinatorics, and also a good background in forming mathematical arguments and writing proofs. The class will be on the level of the most difficult Art of Problem Solving courses.”
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My son did the CTY year long geometry in 8th grade and had a mixed experience.
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I will chime in and also recommend AoPS. They have so many different resources and the courses are top notch. Give a course a try.
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@HazeGrey , tell us more! DS never did any of the classes. I felt like he was giving enough time to school and that those hours should count. If the school fell short (which it did), he shouldn’t have to give up “his” time to take classes if he’d rather play sports and hang with friends. His school wouldn’t let him do CTY instead of their math so he never did online classes. But I was always curious about the classes.
Thank you everyone - I think I’ll focus on AoPS and CTY online first, and get a better understanding of each offering.
Appreciate everyone’s feedback! May come back in a few weeks with additional questions 
CTY LIvE is their online summer camp experience this year. SweetBoy took two last summer and they were great and did not feel like work.
You can take a fast pace math class online through CTY. DD took honors prealgebra in three months and it was pretty brutal but she was very well prepared for algebra.
IMHO geometry is especially hard online. DS had it as part of his virtual school and his teacher remarked multiple times that grades were much lower this year. But, ha, no bonus points/make up work/ extra credit.
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To avoid confusion, I was referring to a specific course offering titled “Fast-paced Mathematics”, held alongside their Fast-paced High School Physics, Fast-paced High School Chemistry, etc. courses during the on-site summer programs. Three weeks on a residential college campus, working 7-8 hours, 6.5 days a week on math in a classroom. The science courses are still in the summer program syllabus but the math program isn’t.
These courses are designed to cover an entire year of high school science in three weeks,
It appears they have again cancelled the on-site programs this summer, so a moot point.
The normal self-paced, subject-specific courses are still available, and can be taken as quickly as a student would like. In fact, cost is time-based, so quick completion is beneficial.
Fwiw, I’ve read mixed stories over the years about CTY’s remote programs, unlike AoPS.
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My son has done both CTY geometry and is now in AoPS intermediate algebra. I really like the AOPS, great platform for improving his math skills. I would say that you’d better like math to do Aops, however.
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