The kids that couldn’t pass without cheating will fail their coursework (some will cheat all the way through college, but that has always happened). The kids that could have passed without cheating will have the same outcome as if they didn’t cheat, except they will have lost some integrity.
So there might be a few extra graduates that make it through because they were able to cheat an online exam in high school, but it’s not going to be a huge change.