S.O.S. Mathematics CyberBoard

I volunteered abroad in rural Ethiopia and a village in a remote mountainous area of China. I plan to return to both places and teach for as long as I can make it work. I want to focus on STEM, but first I would like to reteach myself math and science from pre-school all the way to college-level math, such as Calculus, Physics, etc., so that I am confidently able to teach them. Almost none of them speak English, so I will be teaching them that as well along the way, since I can speak Amharic, Mandarin and Cantonese.

BUT I would like to teach them from a real-world approach. I've seen the website "Mathalicious" and it is inspiring. But I would like to get a set of textbooks that are widely used in academia to get them from a pre-school level of understanding of these subjects, where the only required prerequisite is to understand English, to the advanced levels.

What I've found so far:
Massachusetts Curriculum Frameworks - Massachusetts Department of Elementary and Secondary Education

This website lists objectives and goals, but doesn't list any textbooks to follow.

Hawaii DOE | Hawaii Common Core Standards

This is the only state website I've seen so far that includes state-approved textbook materials that I can go through. It only lists Reading and math so far and the list is not really detailed at all though.

Any thoughts or good links or anything you can advise on? Thank you.