I knew a kid who desperately wanted straight A+'s. He was really sharp, and took physics and math. But when he got to third year, quantum mechanics loomed ahead

I knew a kid who desperately wanted straight A+'s. He was really sharp, and took physics and math. But when he got to third year, quantum mechanics loomed ahead, and, reportedly, he wasn't sure if he could ace it. He abandoned physics, and switched to chemistry. He did, in fact, get a perfect 4.3 GPA. But I think it left marks.