30 1 is very difficult. 30 1 is the code name of Mathematics One, and it is the most difficult one in the postgraduate entrance examination. If you want to test the professional knowledge of Math 29, everything will be involved. 302 Mathematics means that the first test subject of the postgraduate entrance examination is Mathematics II, which is the code of the first test subject. 30 1 math is much more difficult than 30 1 math.