Yes, there are no exemption rules in place that give driving schools free passage on Slovenian motorways and expressways.
All vehicles with a maximum permissible weight of over 3.5 tonnes are subject to the distance based toll system DarsGo.
You can now comfortably order your Slovenian e-vignette here.
Related articles:
Can I buy multiple Slovenian vignettes at once for a fleet?
Are commercial invoices provided for purchases of the Slovenian vignettes?
What vehicles need a Slovenian e-vignette?
Which roads require a Slovenian motorway vignette?
Can I drive into Slovenia without an e-vignette if I avoid motorways and expressways?