Read this passage and answer the question that follows: The Compass Test
I want to tell you a story that shows you why it's so important to ask about a test. A lot of students I work with all over the country take a test called the Compass Test. And when they're taking the Compass Test, they often don't know that this test is important. Some students try, and some students don't try.

The Compass Test is actually very important. It is used by community colleges to place students. And if you do poorly on the Compass Test, you have to go to community college for a whole year while paying but without getting any credit.

How does the author know about the importance of the Compass Test?
He took the test when he was a student.
He worked with students who took other tests.
He researched the test and read about it.
He asked his friends and colleagues about it.