Misty, that looks fine. My kids are math and science geeks headed for competitive colleges and intending to study science–one physics, and one in economics. For them, there really is no such thing as too much math or science. Your schedule looks FINE. Should one of your kids develop an interest in physics or engineering, then adding physics in senior year wouldn’t be a bad idea, but no, I don’t think everyone NEEDS physics. It is fun though! The Saxon and Apologia physics courses are algebra and trig-based, not calculus-based, so your boys could do it in 12th if they wanted to, but I don’t think they’d HAVE to unless they were surely headed for college in a science field.