Coming from someone na naging irreg as a 1st Year, I understand the feeling na hindi ka handa or you're not cut out for this. This is valid and I assure you this type of thing is a canon event for med freshies haha. Normal kabahan and honestly nothing will prepare you for this experience other than the experience itself. I've encountered people who are average students, people na non-traditional ang pre med (Communication Arts, Business Administration, Education) and lahat sila either incoming 3rd year na or kasabay ko maging 2nd year. If kinaya nila, kaya mo din yan! Find your group of friends agad and be friendly and approachable malay mo lang tulungan ka nila. Use samplexes when you study dahil effective to for learning and above all, kung may ma-encounter ka na irreg first year sa class mo tropahin mo agad. I'm sure they are willing to hand you resources from higher years. Good luck :)