No, you cannot work or study with a Poland Visit Visa. A Poland Visit Visa (Type C) does not grant permission to work or study in Poland, or other Schengen countries, for long time periods. It is only for short visits for things like tourism, family visits, business gatherings, or medical care. People who want to work or study must apply for the correct work visa or a national long-stay visa (Type D) before coming to Poland.