<p>Hi, guys. I'm currently a psychology major wanting to switch into one of the biological sciences, so I was wondering if I should take 10 or 20. This also goes back to the question of how hard it is to switch into the bio major with the exceptional admissions and whatnot. So starting with that, how likely is it for a person to get in? And how much more difficult is the 20 series than the 10 series? I got a 4 on Calc AB, btw!</p>
<p>From what I’ve heard the 20 series is somewhat more difficult. Since UCSD’s bio department is somewhat impacted it may be a little difficult to switch in, but I would guess its worth a try! Since your planning on going into the sciences, I would recommend taking the 20 series.
Good luck!</p>
<p>You only need the 10 series to get into bio. Take the 20 series if you’re planning on having a backup major that requires the 20 series, like chemistry or psychology B.S. There are a bunch of threads on 10 series vs 20 series and on the impacted status of bio, so I suggest going through the archives</p>
<p>If your not 100% sure what you want to do in life, you should take the 20 series. It is definitely harder than the 10 series. You learn a little bit more material at a slightly faster pace, but you do the most difficult problems, while in the 10 series, you’d do the normal problems. The little bit extra material you cover is usually at the end of the quarter and that material is not easy. Nonetheless, with a few more hours of studying the 20 series should be easy.
All engineering, physics, math, some econ, some chem b.s majors all require 20 series.</p>