The best thing you can do is hunt down some pre 2000 textbooks and a set of encyclopedias. The internet changes to meet the current agenda, get a good solid base in history, math, science and civics. Ignore the BS in ‘social studies’, use the good book to teach ‘getting along’.
We used mostly books from 1840 to 1860 or so, except for subjects where more modern ones were needed.
Pre 1960 is even better.
You can trust David Barton’s WALLBUILDER organization : )