Carlos should talk to the Department head next if he wasn't satisfied with the mathematics instructor's response.
The head of department is usually in charge of their respective departments ranging from Mathematics to Biology. They are involved in the coordination of the teachers in the department to ensure a high success rate in the course.
Carlos was said to have talked to his mathematics instructor about the
workload and wasn't satisfied with the response. It's then best to approach
the head of department so he/she can talk to the instructor to hear her side
of the story and act on it appropriately.
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