Well, Ive created an account specifically for the reason of replying to this thread and keeping you on the straight and narrow
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Once upon a time I was taking my premedical, postbac coursework through UC Davis Extension, having been erroneously led to believe that I would be able to adequately complete all the needed prerequisites via this avenue.
However, after much frustration and talking to many people within the UC system, I discovered the error of this approach. Put simply, all introductory Biology and Physics classes (and very often Chemistry) are severely impacted throughout the entire UC system. The impaction is continuing to get worse each year at EVERY campus.
The waitlists for such classes are enormous, and, as an Extension student, one CANNOT put ones name down on them. Further, since these classes are limited by available laboratory size, professors simply cannot make exceptions and admit Extension students to their classes. What this means is that you will never be able to take Biology or Physics during the regular school year at UCLA. You would have to take these courses during the Summer. Hence an informal program would take you considerably longer than a formal program, as most of your coursework must be done during summers exclusively.
I have known many people who have tried to complete their requirements through the UC system, and all of them, without exception, have faced this problem. Learn from the mistakes of others!
Furthermore, there is one more problem with an informal program done through the UCs that is too often overlooked: the need in the medical school application process for great recommendations from your professors.
If you take your courses through a UC, each of your science classes will have 300-400 students enrolled. Additionally, your laboratories will be run by (mostly disinterested) graduate students. The net effect of these facts is that it will be almost impossible for you to develop the sufficiently deep relationships with your professors that are necessary to receive stellar recommendations.
In a formal program, it is almost guaranteed that you will have fabulous access to your teachers, and hence terrific recommendations. Further, a formal program will construct a composite letter for you (this makes your life a lot easier in the application process), and you will have access to a premedical advisor.
For these reasons, I left UC Davis and chose to attend the postbac program at Scripps, and, needless to say, was very happy with the results.
In the light of this, I would highly recommend that you do a formal program (at the very least, I would recommend an independent, informal program that is not at one of the UCs). If relocation costs are an issue consider Scripps or Mills. Further, keep in mind that as a doctor, you will easily be able to recoup any loss you once incurred by relocating.