If you want to rely on the four prestigious schools, only Shenzhen Luohu Foreign Language School needs to take the exam. As long as you have a Shenzhen hukou, you are eligible to take the mock exam of the school first. After passing the customs, you can go to Shenzhen Luohu Foreign Language School to take the exam.
If you are in Futian District, it is the school's lottery. Of course, you need a Shenzhen hukou to qualify.