Grades are important, but... also not.
By all means, pass the class. Get an A! Use grades as *one* source of feedback. Over attention to grades, though, can sometimes be the enemy of education. Focusing on the grade can put students off of the often-circuitous route to true learning.
Can you talk about the material without repeating formulas? Can you tell when someone’s made a mistake? Can you teach it to a friend? These things aren’t usually on the test. Though not graded, they are reliable indicators that you’ve mastered a concept.
If you need help, find someone who cares about your knowledge, not your grade. A quality teacher or private tutor will work to custom-tailor lessons to keep the focus on learning the material rather than padding the gradebook.
**Stress on what you need to *LEARN* rather than what you need to *EARN*.** In my experience, when the goal is learning, the grades follow the knowledge almost every time.
Physics and Math are hard! Ask your teacher for help if you need it. Ask me if you need more.