Like I have said in a previous post regarding this sort of thing, my friend (grad and former board of admissions) said that it would have to be a significant change to get your appointment taken away. Meaning, a C in an AP class won't necessarily matter too much. The problem would be in a D or F. They mainly tell us that they can take our appointments back because, in all honesty, they don't want us to feel like we can relax and do something stupid, and rightfully so. We should always strive to be the best we can be. I say this because I want you to not worry, as my friend has told me. Unless you get arrested or fail a class, you will most likely be set. So, don't give in to senioritis, and keep on keeping on. Don't party too hard, and continue to be the person West Point accepted.