There are so many pathways for on-line learning, it is easiest for the parent or student to simply explore on YouTube for topics.
That said, here are a few:
Khan Academy is extraordinary for teaching math and technical subjects.
Learning in early to middle school can be somewhat eclectic based on the interests of the child. Have the student write a simple discussion on what was learned from an experience, book or video is a relevant way to include writing skills and document learning.
Entertaining YouTube Resources
Math and Science
High School and Paid Curriculums
Appropriate for Trades Interests
High Scool Academic Focus
Online High School Free
Free SAT Prep
Food and Farming Study Guide
The largest independent school system in the U.S., giving preference to children of Hawaiian ancestry to the extent permitted by law.