I'd say you better suck it up and get good at Calc real fast. If your tutor is not helping----get another, if you have to go back to the beginning of the semester and learn it all over again, then do it. If you have to kiss off weekends for doing endless calc problems, then do it. Whatever it takes, you need to get the job done. Consider this your first military mission and it is.
If you can't hack calculus now, how are you going to with upperclassmen running your butt into the ground, sports until you drop, and a ton of classes like Chem, English, foreign language, Physics, ad nauseum? You think Calculus is going to easier at the Academy? It is not just something to slide through and think you are done with it either, as you are going to be using it constantly in your science classes for the next 4 years. Man, you are living in doo-dah land. You need to kill this dragon right here and now.