I am profoundly deaf. I grew up in a foster home and I am glad that the welfare dept found a right school for me in the first place. I went to the deaf school from kindergarten to high school. All teachers use signs which is the best method for deaf students to understand and learn, IMO. I had speech therapy there for the first 5 years but I despised it. During my time, there were at least 500 deaf kids on campus.
When I was 16, I found out that I have a deaf brother who is 5 years older than me. I was so shocked to learn that my real mom sent him to a mental hospital where he stayed most of his life instead of a foster home and I still feel bad for him because she did the wrong thing to him.
BTW, my wife went to a deaf program at a public school. There were only 8 deaf students in her class. She wished she went to a deaf school because the teacher who signed in her class didn't teach well and the hearing students didn't talk with her socially.
One of my deaf co-workers told me about her experience at her mainstream school. She was not happy with it because since her teachers talked too fast, the interpreter had to sign very fast so it was hard for her to understand what the teachers said, therefore she didn't learn much.
Deaf school from kindergarten thru high school and your English is excellent!
By the way, did you ever met your brother? Is he out now?