Your stat is “low” but that doesn’t mean you don’t have a chance. I don’t know you, but I suspect you will be the kind of candidate UC’s “holistic” review will be favoring. So if I were you, I’d still apply. If you qualify for UC fee waiver, I think it’s 4 schools free: I would apply to 2 reaches (LA, B) and 2 safety UC (M and R) and forget the rest unless I had extra money in my pocket.
Having said that, if you are taking Algebra 2 as a junior, you will likely be unprepared for UCLA or Cal even if you get in, especially if you are erroneously trying to use CS as math pre-req. There is no “remedial” math at UCLA or Cal and starting calculus there without prior exposure will not be good for your academic career. It’s not like the kids will be smarter, they just would have taken classes you have not.
My bias opinion here is low performing HS generally has little incentive to direct you into difficult classes because they really just want their students to “pass” and graduate. From the sound of what your HS counselor is telling you about CS counting for math, I think you should be cautious in any future advice from that person.
To increase your chance for success and demonstrate college readiness, are you able to take math at local community college? Take trig over summer and enroll in the “easy version” of calculus in Fall (in case you don’t know, most colleges offer 3 versions of calculus: engineering, life science, humanities/business but your local course offering will vary. Any showing of calculus on your application will likely make you a more competitive candidate. Look at Assist.org and find the transferable Math class to take will also make your life at UCLA / Cal easier if you do get in. And honestly, if you can’t do well in a CC math class, you will not do well at any UC campus and that’s time to re evaluate your educational plans.
Once you covered all the basics then it’s up to your PIQ essays to show who you really are as a person. Hope they move the Readers and get you a chance. Remember, write something interesting, you want them to spent more than 2 minutes reading your stuff.
Lastly, if you are set on Business, do not apply as any other major because if you get in, the chance of switching into a impacted major will be low because you will need a high GPA to apply. Although I’ve said the kids there are not smarter, here is where I will say, a few will be wicked smart and those are the ones you will be competing for a spot shall you try to switch into a impacted major.