<p>If you already start with the O-Chem series at your CC, you do NOT have to retake the entire series over at Davis if the O-Chem series at your CC is equivalent to Davis’. I mean, I took the equivalent of BIS 2A at community college and when I got to Davis, I was able to continue with BIS 2B instead of having to take BIS 2A again. O-Chem and math operate the same way.</p>