Comparing the three places, Shanghai Institute of Drugs is the most difficult. You can have a look at the website of the Institute of Medicine/
Not many people are recruited every year, but the scores are high.
The School of Pharmacy of Shanghai Jiaotong University is newly established and jointly run by the School of Medical Engineering, mainly relying on the faculty and scientific research environment of the School of Medical Engineering. And the books needed for the exam subjects are very simple.
Shanghai Institute of Medical Engineering is a research institution under the State-owned Assets Supervision and Administration Commission. Its medicine is very powerful, but its score is also quite high. There are very few people recruited every year, and the whole hospital only recruits less than 70 people. It is very difficult to take the postgraduate entrance examination.