Do not retake Math II, that would be silly. A 780 v. 800 is not gonna matter at all, zero, nada, zip. USC is holistic, so put together an application that shows a passion, hopefully that bends toward engineering. Are you from socal? If not, what state? Urban or rural? The only thing I notice is you took honors Physics instead of AP Physics. Not terrible, it’s just there are others (your competitors) that will come in with AP Physics. But you can bump yourself up with a great application.