I’ll also suggest the native 5, that’s what I carry when I’m at school. We have the same 3” blade rule here so it works out perfectly. With s35vn you’ll be able to hold off on sharpening a little longer. I go home ever other weekend or so and I’ll touch up the edge then. Just a few passes on a strop with white compound is enough for touching up a higher finish, for lower finishes I would assume that’s fine too (I sharpen with 800 and 1,000 grit stones, so I don’t have experience with edges lower than that). I work on campus and am cutting a lot of cardboard up, so depending on your amount of use sharpening may or may not be much of a factor.
Just one thing to keep in mind with the native is that the butt of the handle may stick out of the pocket a little. Depending on your school this may or may not be an issue with drawing attention. If I know I’m going to be walking past a large group of people I’ll just slide the knife down into my pocket so it’s not visible. It’s best to avoid having to hear “is that a knife!?” or “omg why do you need a knife?!” if you can.
If you carry keys on a lanyard that may not be as much of a problem. My keys are in the same pocket as my knife, at times the lanyard covers up the pocket clip and no one can really notice it.
-Kevin