Students are already tested to death.
Not every secondary school is the same. There are a couple of levels:
* VWO ("preparatory scientific education") is the hardest level and prepares students for university.
* HAVO ("higher general education") is the level below that, and prepared students for higher professional education (HBO), or they can choose to do the last two years of VWO in order to qualify for university (though they can also go to university after higher professional education)
* VMBO ("preparatory medium professional education"), used to be called "lower professional education". Teaches students practical skills (trade school?), after which they can get a low-level job, or move on to medium professional education (MBO), or they can do the last two years of HAVO to qualify for HBO or VWO.
In the last year of primary school, students do a "Cito Test", and based on that and the opinion of the teacher and school, they get a recommendation for which level is most appropriate for them. Often it's a mix, like HAVO/VWO, so the student would best go to a school that offers both HAVO and VWO.
I have no idea what happens when a student picks a school that's way outside their recommendation. I expect they'll be refused, but I have no idea at which moment in the process.