The following is a list of organizations that indicate they provide Drupal training services.

For upcoming Trainings check Events section and Global Training Days.

Cheppers

We provide a half year long Drupal 8 training for junior PHP developers.

Team work, collaboration: git basics, git flow
Build & test: how to test projects, what makes a test good, Gulp, Grunt, Phing, Robo, PHPUnit, behat tests
PHP tools: Composer, twig, Symfony API
Drupal 8: drush, drupal console, Drupal 8 API (plugins, themes), how to contribute back,...

http://cheppers.com/hu/drupal-akademia