What is the meaning of the following traffic sign?

1. Entry is permitted for driving-instruction vehicles during the course of a driving lesson..
2. Correct answer: No entry for driving-instruction vehicles during the course of a driving lesson.
3. No entry for new drivers.
4. Entry is only permitted for two-wheelers used for driving-instruction purposes.

WhyA learner car in a red circle means no entry for driving-instruction vehicles during a lesson. The sign does not apply to new drivers.