The school seats must have a special construction, as it is not just chairs but school chairs for students and should have strength, to be anatomically and not distract the student from the lesson.
Usually the seats are made of plastic used to have fewer losses in the year, easy to clean and they have flexibility.
The upholstery chairs are usually used for adults seat with fabric or artificial leather.
There are also the folding chairs which could be placed in the area where we want to use for multi purposes except of classroom and they have also greater flexibility.
Finally, there are metal chairs for even more strength but the design must be such as to not tire.
Your choices are on the left side of the screen.