Are 2 Lab Sciences and 2 Breadth classes too much?

Colleges and Universities A-Z University of California - Riverside
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I plan on taking Bio5A, Chem1C, and 2 Breadth classes in one quarter and am wondering if that seems like too strenuous of a schedule? I also plan on working a on-campus job that on quarter. Would it be better to stick to one Breadth?