<p>so… pre-med reqs for chemistry are 1 year of general and 1 year of orgo… form the usc catalogue website i only see 1 1 sem. class of gen and 1 of orgo… so what other 2 classes do pre-meds take?</p>
<p>Most likely, you’re only seeing it listed as like 105abL General Chemistry - really it’s two courses 105aL and 105bL. Courses which are very frequently taken in a one year sequence, and have the same catalogue description, are given “ab” designations instead of separate course numbers. </p>
<p>There’s no real difference between courses with “ab” and separate course numbers, except the “b” course usually has the “a” course as a prereq. You can certainly take the “a” course only (if the “b” course is not required") and you can also take the “b” course in a different year as the “a” course - so you theoretically could, say, take the “a” course spring freshman year, and the “b” course fall junior year, assuming you have time to finish any courses which have “b” as a prereq, and the courses are offered at those times.</p>
<p>ahh ok, i get it now! thank you so much</p>