<p>Respectfully, I disagree with HONORLIONS’ advice above.</p>
<p>Many UCs are pretty selective–some more than others, of course–but I don’t think tanking in AB Calculus will help the OP’s chances of admission at any of them.</p>
<p>I am taking the OP at his word when he says he is weak in math, that he (or she–but I’m not going to keep typing or she, and I hope nobody will be bothered by that) has a poor foundation in algebra, and that he struggles with material on the level of quadratics. This will be a huge problem for him if he does decide to major in business, because he’ll almost surely have to take a business-oriented calculus class, and possibly calculus-based economics as well. But the way to address this problem is by retaking the subjects he hasn’t yet mastered. It will probably be less administrative hassle to do this in college, by going back and taking college algebra, than by repeating something he has already passed while he is in high school.</p>
<p>And, really, pushing on into calculus when you’re struggling in Precal and weak in algebra is asking for a whole world of both misery and trouble. Frankly, I think honors Chem sounds hard unless you’re pretty good at Algebra II, especially logs.</p>