My daughter is a junior in HS this year, and she's pretty well motivated too. Agree that it's definitely less than 100% of what they'd normally get in regular classes. She's even said that herself. I might go more with your 75%, from what I can tell in what she's doing, but that's just a guesstimate on my part. While there's a decent amount they can do "virtually", you certainly cannot get everything. Including a lot of 1-on-1 if needed, or collaborative type projects. I imagine tests and grading are more lax too, just due to the nature of being remote. I'm still waiting on if or how the AP exams will be given this year (that's a nationwide thing though).