* Taking a high school science course that covers the same content as a college-level science course.
* Taking a high school math course that covers the same content as a college-level math course.
* Taking a high school English course that covers the same content as a college-level English course.
* Taking a high school history course that covers the same content as a college-level history course.
The answer is none. All of the examples listed are examples of what rigorous coursework in high school might mean. Rigorous coursework is coursework that is challenging and demanding, and that requires students to think critically and apply their knowledge.