This is not necessarily true, because there are many people who apply for the exam, so it is naturally difficult to take the exam. Just like the college entrance examination has a fixed number of years.

Generally speaking, Beijing University of Technology scored a little higher. But if you study machinery, you should combine your own situation. China Agricultural University must engage in more agricultural machinery, which is related to your future employment. University of Technology is an engineering major, which is more suitable for mechanical major. I suggest you take this school.