My teacher training was at Sydney Teachers College in 1962 and it was mostly useless. I had to learn how to teach effectively on the job, but even so, it wasn't until I went to work in a catholic school where the nuns were committed to teaching the whole student and every student regardless of social background or intellectual capacity that I truly understood what teaching is all about.
Midcareer I had the opportunity to return to university to take a course about teaching children with special needs and this was an eye opener. Later I enrolled in a post grad course devoted to the needs of gifted and talented students.
It would be a wonderful thing if school teachers could avail themselves of a paid sabbatical year after ten years or so of being in the classroom to engage in further study or research into specialised education. It could be a masters degree, or simply and undergrad course in something relevant like the needs of indigenous or disadvantages children.
It will never happen, of course, because it would be expensive and only well endowed private schools could afford such largesse, but perhaps if the teacher were to sign a bond requiring them to serve the education authority, or an individual school, for a set number of years in return for having tuition fees reimbursed, then maybe this could be a way of uplifting teaching standards overall. It would certainly benefit a lot of students.