If you go to a class high, then you will develop a "high mindset". Your entire outlook of what is going on in that class will be set in stone. This means that you will have to go to the next class high. From that point on, you will be forced to go to that class high, or else you would not understand any of what is going on. When the final comes, you will have to go to that high, too.
"Hey man," he said, "I think I'm gonna smoke before class today."
"Naw dude," the other boy retorted, "Haven't you ever heard of Ben's Theory? If you go to one high, you go to them all!