Always give 110%, that way you’ll never have to regret not trying.
This is a piece of advice from one of my college professors. He was one of the most hated professors on campus, and one of my favorite. Sure, he was a tough grader, but he really wanted to make sure you were learning, and understanding the material, not just make stuff up. I wasn’t uncommon for a straight A student to fail his class. He was tough. It wasn’t even uncommon for student to cheat on the exams and still fail. But if you put in the effort, you could pass.
I won’t say that I was a straight A student, though a did get a 4.0 a few semesters. I’d classify myself as an A/B student. And that’s what I got in his classes. Because I studied.