Many deaf children in Kenya go to residential schools which become their family. Some residential schools do not have secondary schools because many deaf children do not pass the national exams required to move from primary school to secondary school. Some schools have vocational schools instead of secondary school while other schools only have primary schools on campus.
Residential schools become the deaf child’s family. Some deaf children start school at age 12. While primary education is free in Kenya, residential schools are not free.
Deaf units are basically small classrooms with deaf students at hearing schools. My understanding is that it’s not mainstreaming and sometimes these classrooms are combined with children who have other disabilities.
I have not once heard the term “mainstream.” I do suspect mainstreaming does happen but it’s not as common or the term simply may not be used.