How can a teacher teach without a school? to rehearse? And what, will he be able to write an attestation on the middle education of at least one child?

children, before throwing the dirt type "generation EGE" (ha, I universe finished years before... before the invention of EGE), study the match. There is "family education": the child studies at home, and in school only passes the exams and the same GIA-EGE. For these purposes, parents can even take money from the state, usually given to the school. Several such parents unite and hire such teachers to arrange them. As a result, the child also receives education, and the certificate - and the teacher works as "IP on the patent". Everyone is happy, as it was said in Eralash.
I will not say about neurosurgeon, I will say about reconstructive orthopedics. This is when the joints change. The equipment is similar. There are many clinics that are a surprise! - invite surgeons for specific operations. The room, license, sales department is a clinic. A surgeon either agrees to lead a particular patient for the agreed amount or not. Shut up?
In plastic and reconstructive jaw-face, 80 percent of surgeons do so. Only 20% of the salary. Nothing breaks down, no horror happens.