From working visa to student visa in Poland

Dear forum members,

I came to Poland with a working visa (D-06).
Since then I have been working and making money for my tuition fee.
Now I want to apply to a master's program in February intake.
· The question is, can I change my status from working (D-06) visa to student (D-09) visa while staying in Poland?
My working visa is still valid.

Thank you!

And the reason why you didn't ask the bureaucrats who issue visas is what?