I'm a prof and will use these weeks to "redo" a year in which DC learned nothing in 4th grade:
Lumos Learning (just for tests)
IXL - just to make sure we've covered all the random things up through 5th grade
Beast Academy for all math
Kilgannon books for writing
Maybe a Khan Academy science class if he likes it
Last summer he did Crash Course history classes all summer - changed his life and interests
We read books on tape together all through the year, and he is really into nature and science so we have done things related to that outside of school, and will spend more time outside this summer. He loves to write fiction stories in the summer.
I can't wait for summer. He's just staring at a screen and learning nothing for 6 hours a day. He does watch history and science videos during break so he feels he's learning something.
The worse of it is: When he goes back, he won't be learning much more than he is now. This is what the curriculum is. It has nothing to do with remote learning!!!!