That’s… definitely not true. Granted it surely depends on your school system but you need to get at least 60% of the way to “perfection” to qualify for a D- in the normal scoring system.
I remember over a decade ago there was a fan animation of this strip with voice acting. Wasn’t very good voice acting but it was still really cool to see at the time.
Huh, you don’t get many solo focus comics of Susie.