Well, more is more.
Knowing what those things -mean- is a start. I don't think anyone will expect you to be able to read a slide and make a diagnosis -- and really, the med student textbooks often don't show you H&E pathology very consistently such that one could learn those things from those books. I.e., your resources are probably limited. Still, simple clinical-pathologic correlations are good to have in your pocket. Every pathology department gets a slightly different set of core specimens. Colon cancer is a good common and relatively easy one, renal and lung cancers are also fairly common but there are different flavors. GI biopsies/polyps are usually pretty common, and often one of the first things new PGY1's learn about (at least, we did). Those might be decent things to know a bit about just from Robbins or whatever med student path book yall use. If you're a real gun you can try to find a copy of one of the general surgical pathology books to read from, but I've never seen a medical student do that, certainly not before they even started anyway. Maybe some on a follow-up rotation once they were sure they wanted to do pathology. If your hospital happens to have a big surgical service in something else, maybe read up a bit on that. I wouldn't kill yourself because you could find out you're reading up the wrong tree once you start, but if you're looking for anything to grab hold of, those are probably worth thinking about.