ophiuchan asked you:
Since you are spider scholar supreme, what was Peter’s major?
Oooh, that’s a kettle of worms you’ve just opened there.
The simplest, safest answer is that Peter was a “science major,” which is vague but how he refers to himself several times in Lee and Conway’s era. Once you get more specific than that, the evidence starts to contradict itself.
Marvel.com’s official (but fan-maintained) wiki states that Peter’s education level is: “College graduate (biophysics major), doctorate studies in biochemistry (incomplete).” I definitely remember Peter calling himself a physics major, but he also spends a lot more time in biochemistry classes and labs than he does in physics, and his undergrad mentor Professor Warren is a biochemist.
As for his post-grad work, when he starts graduate school in Spectacular Spider-Man #36 he’s identified as a biophysics student, and again when he resumes his interrupted studies a few decades later in Amazing #421. (He drops out again later.)
So there’s the safe, definitively correct, and hideously vague answer (“science”), the semi-official but not definitive answer (“biophysics”), and the most accurate but not especially helpful answer (“biochemistry or biophysics.”) Wibbley wobbley sciencey wiencey?