To find this information, I recommend you try the following:
* Search online: Use a search engine like Google, Bing, or DuckDuckGo. Search for "gymnasier København" (gymnasiums Copenhagen in Danish) or "high schools Copenhagen". This should yield numerous results, including potentially official city or educational authority websites.
* Check the Københavns Kommune website: The official website of the Copenhagen municipality (Københavns Kommune) will likely have information on schools within the city. Look for an education or schools section.
* Use a Danish school directory: There may be online directories specifically listing Danish schools.
Keep in mind that "high school" in the Danish context translates to "gymnasium," and these schools often have specific profiles (e.g., focusing on specific subjects). Your search results might list them by type or area.