Answer:
Carlos is attending a charter school.
Explanation:
Charter schools are a model of public school (in a way that it doesn’t charge tuition and it’s open to all students) that receives government fundding, but at the same time operates independently, which makes this model adopts the logistics of private management, like in longer work hours for teacher (labor issues), for example, and also have loose regulations regarding public accountability. So it's a combination of both styles.