Switched On School House was suitable for us growing up. (Warning, old versions of the software require flash to run and therefore do not work on most current PCs). All of us completed grades several years ahead of time. Abeka was considered a good option too... Frankly, these curriculums have so much content it borders on busywork, so don't be afraid to spend more time on problem areas and less where you don't need to. These didn't cover issues like politics and personal finance as well I wish they did though. Learning how to read research papers was also important, but I don't recall how I picked that up.

Make sure to incorporate writing projects you assign on your own. Writing skills are one of the main issues I've seen homeschoolers have. I think a lot of parents shy away from writing assignments because they have to grade those with their own judgment and not an answer key (if that's an issue, that's a good example of when to bother with a tutor). Make sure to handle writing in MLA format, but also make them practice writing both professional and personal letters, emails, reports, comments, texts, instructions, planning, outlines for videos, etc.

Mid-high school, my brother who got a bachelor's switched from the typical home school education to looking at the college classes his degree will require and getting the books for those core classes. And studied those, and took as many CLEP tests as he could. Even a tutor for this would likely be a monetary win because of the savings in college.

Don't be afraid to embrace the fact homeschooling allows learning to come from living. Consider making it clear being productive means getting extra freedom. I spent tons of time using photoshop to make things back when you had to buy magazines for tutorials still. And 12-year-old me knew that I better keep plugging away at my projects or I'd get handed extra math sheets instead. My math still got done, but the busy work wasn't needed as long as I was doing mentally engaging activities in its place. And that led to me finding my future career which was a VERY important part of my life.

On a side note, I have a specific video game I recommend for education's sake. Portal, by Valve. I found that it asked preteen me to do puzzle-solving which made me learn to THINK. It probably wouldn't have had as big of an impact if I was older, but I do feel like learning to "think with portals" jumped me ahead of my peers. Not ideal for small kids though, bad guy robot is a bad guy. Although it's an overall good story to go with the puzzles.