There is one option that I would like to suggest. A top 60 university contacted me and said that if a student is admitted to one of their prep schools for one year, then they are also accepted to the university. Please contact me for more information as the school doesn't want me to disclose its name.
Transferring as 12th grader is not a good idea. Rather, if you want to come to Manhattan, please work hard to find out colleges and universities near or in New York city. I do not know why you want to transfer at this stage. Without compelling reasons for transfer, it is not a smart move.
12年级转校不是一个好主意。如果你要来曼哈顿,请努力查找在在纽约市附近的高校。我不知道你为什么要在这个阶段转校。如果没有令人信服的理由,不是一个明智的举动。