Final examination Professional driver

Moin colleagues, would like to introduce me briefly: I am 32 years old, drive trucks since 2005 and currently take a preparatory course for the external test to the professional driver, which lasts a total of 4 months. Now my question, what does the test (predominantly the practical) bring to me?I mean, driving and shunting is clear, but would like to know how the exact procedure is or what the practical part still contains. Because my instructors… well, I can’t get really useful answers… MFG