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^^ Because you are not taking course rigor into consideration. Calc BC, which you took junior year, is considered by many Admissions Officers to be the “holy grail” of AP’s – in other words, it’s tougher and more rigorous than the math courses you took in freshman and sophomore years. So, although your grade of B in Calc BC is technically on a downward slope, you took a very difficult course as a younger student and did well. The vast majority of HS applicants, including my kids, did not take AP Calc BC until their senior year – and colleges WILL notice that, especially if you also took the AP Calc BC exam your junior year and scored well. All selective colleges would prefer students that challenge themselves, and therefore getting a B in Calc BC as a junior is more impressive than taking geometry or algebra your junior year and getting an A. You need to stop beating yourself up about this issue and move on, as there is nothing you can do about it anyway.</p>