The worst students for me are the ones who come across like they lack interest and are counting the clock until when they can leave, whereas the ones who show genuine interest and are always willing to lend a hand, they stand out even if their knowledge isn’t the best (in my opinion).
Final year students rotate through our department every other week, and absolutely this. The ones that we go "ahh I hope they apply to clin path!" are the ones who are excited to be there and do the things. One important example is the difference between students who review their course notes from 2nd year, versus the ones who show up having forgotten basically all of it, not bothering to rectify that on their end, and needing to be re-taught basics. Frankly, just being actually
interested in a subject is a huge plus, and not showing up like, "Oh, another rotation I have to survive." IDK about other specialties, but 50% of clin path is texting other clin paths pictures of cool cells, so when students appreciate our gushing, we appreciate their appreciation
Pre clinical year, my advice is just worry about doing well. Learn the foundational material. Then in clinical year is when you spend a lot more time with the faculty and clinicians that will be your references or, if you go the same place, your advisors in residency. That's the time for best behaviour and extra reading. If you really,
really want to stand out, there might be some small research projects your favourite faculty could have you work on, but I'd hesitate to recommend that kind of above-and-beyond stuff unless you have the mental health stability of Excalibur's sword. Standing out is less important than doing well in your actual classes and retaining the important foundational info.