Yea, I'd say that going into first year about 95% of Health Scis are aiming for med school. By the end of the four years, it's about 50%. People find other interests or realize it's just not for them.
Anyway that's unrelated lol. Tips? Work hard, learn a lot, and enjoy your year as much as possible. Then providing your gpa is high enough, put most of your effort into the supplementary, as that's what really gets you once you pass the grade cut off.
In the end, like others said, whether you're in Healthsci or Lifesci, your chances at med school are the same. Trust me there is no "paved way" in that respect.
On the plus, if you do get into Healthsci as a transfer, you'll be far more prepared for second year healthsci than most healthscis that were in the program from the beginning..or so I've heard.