Nanjing University's chemistry major ranks in the top three in the country, and with the reputation of Nantah, it must be the high score of Nantah. As long as you have confidence in yourself, see how many points you can get in the postgraduate entrance examination. By the way, remember to pay attention to the bibliography corresponding to that major in the two schools, which may be different. The score of chemistry major in Nanjing University is around 340 (finally admitted). You can't just look at engineering. It may be 300 points, but it's not enough. If you can get above 350, you have a good chance to go to Nantah.
For Southeast University, the minimum final admission score should be around 3 10.
Good luck.