Wait so why are you taking math courses? A lot of people do History and PoliSci as a double-major. Yes, it's feasible that you'll graduate in 4 years with those majors with a few 4-class quarters; I doubt you'll need summer quarters unless you really want to spread out your units. Why do you want to double-major? It'd be a lot more wise to choose one major and max out your GPA. As for accounting, have you looked up admissions policies into that minor? If you're truly interested in Accounting for whatever reason, go for it. If you're solely interested in law school, it won't matter how many majors or minors you've acquired.
As for GE classes @ comm coll, check UCLA policies about how many courses you can take at CC and until which year. There's a limit I believe.
As for the 3 series, again, do you think it'll hurt your GPA? If so, I'd avoid it.