Math academy, https://artofproblemsolving.com/school/course/prealgebra1-sp, ALEKS

Is it $50 per month per student, or $50 per month for all of you?

Can you upload them anyways for posterity's sake?

If you want something "sideways", check out mathematics: a human endeavor

https://artofproblemsolving.com/wiki/index.php/List_of_United_States_elementary_school_mathematics_competitions For preparation, you can look at https://moems.org/product-category/olympiad-books/ (specifically creative problem solving in school mathematics) and/or the Borac books followed by AoPS prealgebra and/or Alcumus prealgebra at the easiest setting If you want a course, Alphastar has a course (MC15) on elementary competitions for 4th and 5th graders. https://www.mathleague.com/index.php/online-store/contest-books-grades-4-6-grades-7-8-algebra-1-high-school/36-mathleaguewebsite/shopping/52-grades-45-and-6-contest-books https://online.mathleague.com/login.php https://www.noetic-learning.com/mathcontest/pasttests.jsp https://www.noetic-learning.com/gifted/index.jsp https://www.beestar.org/exercise/samples.jsp https://www.cmleague.com/product-category/books/ https://www.matematica.pt/en/useful/kangaroo-questions.php https://ikmc.kangaroo.org.pk/past_papers/3162

https://virtual.aopsacademy.org/ https://www.wtmacademy.com/course/pre-algebra-aops/ https://www.rfwp.com/online-learning/courses/?cf_search=&cf_subject[]=320#courses https://www.loveofmath.com/course/algebra-ii (another algebra 2 course using the introduction to algebra text)

I seem to notice that all the pros for school would likely also be pros for DE. DE would also mean he would also only need X semesters of history instead of X years of history. (And maybe also X semesters of writing instead of X years of writing, if necessary) He could also take upper-lrvel math like an intro to proofs or probability instead of having to retake a math class he already learned

I would call it college algebra. There are self-paced options for precalculus like Unlock Math or ALEKS (which is free via EdX).

Magic Treehouse has the "Merlin Missions" series which are meant for older/more advanced readers

You can try supplements, like Vayarin - it's a prescription phosphatidylserine-bound omega3 pill. Taking PS-bound DHA improves brain bioavailability compared to ordinary omega 3. I'd also suggest D3 and Magnesium. I recommend clarimag since it has both plus some other goodies.

Yes, you can definitely move on to C&P if your son wants to move in that direction before algebra 2. WTMA uses the Intro book after chapter 13 and some of the Intermediate book to make up their honors Algebra 2 course: https://docs.google.com/document/d/12WwhrH7Z8BPh24kZelazK2tpaE5Vand0Sf8Kj3zHYas/edit?usp=sharing and the also only go through chapter 13 in their honors Algebra 1 course: https://docs.google.com/document/d/1bar66AI7jhbs7paOiFw9fw3KfGTxitaekfYwKYE-clM/edit

http://library.lol/main/DDFC49CC58F0D8544AE87C96806562B7 http://www.readingbear.org/ https://larrysanger.org/2010/12/baby-reading/

Can you attach that list?

How and where does it repeat?

https://www.pandiapress.com/history-odyssey/ https://www.amazon.com/Thinking-Physics-Understandable-Practical-Reality/dp/0935218084 You could probably use living books from the lists in some of these sources - they're light on math and probably accessible to an advanced middle schooler:

What about the others didn't work?

Don't you need to be 18 or older?

This used to be true but I think they've revamped their algebra offering

https://usaco.guide/ is a great free resource for competitive programming, although I would suggest taking it after a thorough programming course like CS50

I think you should check with your country to make sure that AP CS principles would count toward the three required APs/Alevels/IBHLs Why not both?

Try UWorld for math

You can get ebook versions at libgen.rs, also check bookfinder.com, some places have cheap shipping to canada. The DK super simple series are also pretty good overviews and Thinking Physics is great for physics at young ages - but I would second the recommendation for trade books

I think this depends on why the kids is taking the AP courses - if it's to improve their programming skill, then a python course like the one I linked can still be valuable

You might find these helpful: https://quarksandquirks.wordpress.com/2012/03/16/what-do-we-do-after-singapore-math-6b/ https://singaporemathlive.com/after-singapore-math/

He could probably do AP CS P next year and do fine, it's an easy course meant for students who haven't coded at all yet. If you do choose to go self-paced, check out these courses: https://www.edx.org/xseries/harvardx-cs50-ap-computer-science-principles It should be a good challenge even if they already know how to program