1.Top50 Only Cornell and Northwest China open spring enrollment. No matter in the spring and autumn, many Top50 students don't even accept transfer applications, let alone non-sophomores and juniors. Plus, you don't have TOEFL, and the chances of transferring to the top 50 in the United States early next year are slim. Postpone the TOEFL test until the fall of 20 13, and the chances will increase slightly. However, the probability of successful transfer from China University to the top 50 universities in the United States is still lower than that of undergraduate application and far lower than that of graduate application.
2. Even if you lower your standards and successfully transfer to an American university for junior year, your courses in medical school so far will be counted in the lower normal class, and you will have to take a lot of compensatory time off, which will affect the graduation time.
From the point of view of saving time and money costs and the greatest possibility of successfully entering a good school for graduate study, it is absolutely necessary to maintain the excellent results of the current school while obtaining a degree and apply for graduate schools in the United States. If you study for the Bona Prize, your chances are very high. The final result is much more cost-effective than the investment you want to transfer to an American university now.