In fact, the decision now is up to you. Of the three schools, I know Dalian Maritime University better. I am currently in Dalian. Of course, after I arrive at this school, you must choose maritime as your major, because this is the advantage of this school's major, and my future work direction may be in coastal areas, related to shipping.

Shanghai Institute of Technology, in this metropolis of Shanghai, can broaden our horizons and the competition is fierce. There must be many excellent people around you, and of course the consumption should be higher. I think there are more opportunities in Shanghai. As a financial city in China, there are many companies and opportunities.

As for Zhengzhou University, if you want to be stable, you can choose. I don't know much about this school. Personally, I still think I can go out and have a look. Otherwise, I can't get out in the first step, and I can't get out in my life.

As for choosing to do it yourself, I hope it will help you. Decisions are made by yourself, not by others, just as life is your choice. Good luck!