It wont make that much of a difference tbh. In addition, attendings and residents often have lower expectations when you first started out, they do expect you to improve over the course of your rotation tho so pay attention to each attendings' "style of presentation," attending A might want you to just give a succinct presentation whereas attending B wants you to read the full autobiography of such patient.
IM is pretty broad but about 90% of the time inpatient IM will be COPD, Afib, CHF, asthma exacerbation, a few DKAs here and there, PEs, Pneumonia, HTN emergency, ESRD, AKI, stroke, MI etc. These are the biggies, I bet you will see at least 1 or 2 of each of these during the first week of your rotation, pay attention to the management and the reasoning for such management during this first week, if you have nice residents and interns, they will prime you up for success. Read the notes especially the Plan and Assessment.
If anything with the Step 1 minutiae still fresh in your cranium, you will be able to recall and answer the more esoteric pimp questions.
You will be assigned a few patients to follow, own those patients, those are YOURS. Ask if you can go see the patients first and do the admission, write the n0tes, go home read on their conditions, pre-round on them the next day, talk to the nurse to get the updates from the night before.
Read the consultants' notes so you can mention it in your presentation of your plan, your attending will ask "so what do you want to do?" you can say "so I saw that Cardiology has dropped a note and this is their recommendation..." that way you can learn from these specialists and at the same time you can show that you pay attention to details and follow your patients closely. Also labs, studies, imaging results.
NEVER EVER LIE about something you didn't do, its ok to say "idk," "I forgot to do it" "I'll go look it up"
If you don't know something, it's ok to ask questions during round but if rounds are getting too long, learn to keep your mouth shut or your residents will hate you
The nice perk of having IM first is that it gives you a nice foundation for the rest of your 3rd rotations and shelf exams. I learned a **** ton after 12 weeks of IM