1. Relatively speaking, Shanghai and Beijing have more advantages: ① talent concentration; ② concentration of dominant medium; ③ Concentration of educational resources. So the competition between the two cities will be miserable.

2. Guangzhou and Shenzhen should belong to the second ladder, but there are also many excellent schools here, such as Jinan University, Sun Yat-sen University and Shenzhen University. Compared with going north, the competition will be eased.

I suggest you according to your own strength: if your English and politics add up to more than 150, you can basically apply for any cow school you want. If you can barely pass these two courses, or you can't get high marks, it is recommended to choose a school with a little less competition.