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https://www.mathacademy.com/ is probably the most popular HN response.

It's expensive at $50 per month, but it seems highly thought of if you look at Algolia (https://hn.algolia.com/?q=math+academy).

I haven't used it myself, but I am evaluating it for my kids to use.

It's too early to give feedback on that front, though.

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I’m using it for my middle school child to accelerate math. I figured it was better than the in-class math enrichment classes that just rush through common core math curriculum, and cheaper I should add.

They are also WASC accredited if you’re in the US.

Yes, I heard about Math Academy, and will likely give it a try at some point. The price tag has made me a bit reluctant, but given the near-universal praise, I might bite the bullet.

You could also try beast academy and aops. We are huge huge huge (did I mention huge?) huge fans of them and have worked through pretty much all of their classes (1st grade through pre-calculus thus far).

Beast academy is around 15/20 a month and apps is more but you can just buy the book and work through it. Richard (the aops co/founder) has a ton of YouTube videos as well.

A third option is aops’s alcumus - which is a free math problem database. We use that a bunch as well and you could use it to figure out what you know and don’t know

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