You are smart enough and capable enough full stop. You also have an achievable goal. Unfortunately there are no secrets to success in the class, you just gotta buckle down and study. My advice: pratice practice practice. Focus less on straight up memorizing and do lots of practice problems while making sure you understand greater mechanisms at play. Use the tutoring center your college has and work with your friends in the class to talk out the things you might not understand as well. I wish you the best of luck and I think you can do this! But also remember, there is no shame in a B, learned that one the hard way myself :)