The other three are roughly equal. Beilun Middle School is short.
About the level of 20 or 30, it is best to win prizes in academic competitions.
You can also consider Zhenhai Middle School, Xiaoshi Middle School Headquarters and Yinzhou Middle School, all of which are quite good. Zhenhai is very difficult to take the exam. Basically, you won the first prize in math and science competitions. The latter two are slightly better, about 5- 10 before grade.
In addition, if you want to take the exam, you must have a comprehensive quality evaluation for more than 2 years. There are three good and excellent student cadres who have special skills to practice.