往上转也不容易

https://www.campusreel.org/how-to-transfer-colleges/stanford-university-transfer-requirements#:~:text=Stanford%20University%20accepts%201.15%25%20transfer,to%20submit%20standardized%20test%20scores.

the transfer acceptance rate for Stanford University is 1.15%.

https://www.thedp.com/article/2019/07/penn-admissions-transfer-acceptance-rate#:~:text=Penn's%20transfer%20acceptance%20rate%20drops%20to%20record%2Dlow%205.9%25,-By%20Ayelet%20Rubenstein&text=Penn%20admitted%20174%20students%20out,student%20acceptance%20rate%20of%205.9%25.

Penn admitted 174 students out of a record-high 2,951 transfer applicants for the 2019-2020 academic year, yielding a transfer student acceptance rate of 5.9%.