Transfers between LCME-accredited medical schools typically only occur after the second-year and only into an available spot in the incoming third-year class. Thus a transfer after only one-year into the incoming second-year class is probably not possible at Drexel or any other MD school in the US.
Transfers into third-year classes usually require 1) an open spot in the third-year class (e.g., someone failed out during second-year, someone failing to advance for some reason, someone deciding to take a year off, etc.), 2) successful completion of the USMLE Step 1, and 3) a compelling reason for transfer OTHER THAN that the school has a better reputation.
Good luck.