It’s definitely grades. But that’s coupled with the fact that I grasp concepts pretty fast and can understand how things work generally at s glance. The minutiae I can grasp if I am interested (it’s novel), but my brain will actively jettison information it doesn’t think I need or doesn’t think is useful.

If I couldn’t learn I wouldn’t be able to do any of the trades I’ve been successful at. But I do see what you mean.