Dominican school system - pre-kinder, kinder, Grades 1-8 Primary (Basic), high school Grade 9-12 (4 years)
Teacher education- 2 year programs( basic education) , or 4 year programs
(actual degree in teaching).
List of universities in the Dominican Republic - Wikipedia, the free encyclopedia
Yes after he graduates from High School he has a choice of the above list of Universities. The two teacher program isn't worth a pinch of coon sh-t. There are of course many other professions that may interest him, afterall as you say he's only in grade 4.
As for Bachillerato tecnico or Vocacional it depends on the program, as it can be from the 4 years of Bachiller to as many as 6 with a certificate issued at completion.