During my freshman year i took 1 AP and 2 Honors, but i got a B in bio and in an art class will i still have good chances at big schools like Stanford and Princeton.
Sure. Two Bs in freshman year won’t really affect your chances!
Two B’s freshman year won’t be the reason you don’t get in. Just be sure to cast a wide net as the schools you noted are reaches for pretty much anyone as both have acceptance rates below 7%