It's useless for you to learn math. The key is whether you study engineering or science or economic mathematics! But in any case, math is good, and the postgraduate entrance examination must be dominant! If we only say Liaoning University, graduate students majoring in economics are worth considering!
3. I can't help you because I don't have a score line at hand, but the score line of Liaoning University is higher than the national high point (15), which is not too much, so it should be considered as a better test!