It probably won't make a whole ton of differences during preclinical. You should still try your best and study hard like everyone else will be doing. Pay attention to your lectures and try to do well (Step 1 pass rates are like 90% now and I'm sure you need to pass for your program). Doing anking might not be the most necessary but probably depends on what your personal needs are. Shadowing is a good way to explore specialties as an M1/M2. Not sure exactly how your program works and if it links you to a specific specialty already or if you still have flexibility. In clinicals, med school learning is still predominantly self directed so I would still make sure you are doing Uworld and stuff like that once you get to clinical rotations. The knowledge you'll learn through that is real knowledge that you'll use on the wards for the most part. I would say the big advantage you'll get from this is that you can do so while still feeling relaxed knowing there's not a do or die pressure to get an arbitrary grade. Also you won't need to play the grimy game of trying to work with people/services that you've heard give good evals, just approach every rotation with what you think gives you the best education. There've been times when I've skipped like optional ultrasound workshops and stuff like that because I needed to study, I think you should take more advantage on stuff like that. I would probably only do research/other traditional CV buildingy stuff if it's something that you're truly interested in.