The math test 140 should be very difficult. I count 3 to 145, but it is much more difficult than counting 1 or counting 3. Counting a person's postgraduate entrance examination, you usually look at Chen Wendeng's postgraduate mathematics for three times. You must be able to do and understand every problem. Basic pass 660, a good book, you can do it several times. It is also good for Li Yongle to surpass 135 in the sprint. Also, when you review what you think is not bad, you can consider taking a look at the real problems of doing postgraduate mathematics and see where the weak links are. The key point of postgraduate mathematics is perseverance, and it is not impossible to calculate 140.