i agree, who cares about the A, as long as you feel you sufficiently know and understand the material then you're fine. the margin for error to make an A grade is slight and a wordy question on an exam or some inexplicable detail that you needed to remember to answer the question could be the difference between an A and a B, does that really make all the difference in the world if you could not answer those couple questions? probably not, so just enjoy yourself while you're in the program.
people who worry so much about their grades perform much more poorly than those who take a lighter and more encompassing approach to learning. i see these ppl freak out before exams, try to pull all-nighters so they can cram every last detail in, run themselves into the ground stressing about everyhting, they just need to relax, you pass even with Cs...so....grades aren't everyhting, though i don't approve of just low balling and doing the minimal to jsut get the C to pass, you should still try the best you can but no need to go overboard.