 In the United States comprehensive high school model, all students are expected to complete 12 years of public education, with some students taking primarily vocational based courses, while college-bound students taking primarily academic courses, but education reform seeks to graduate all students with some work experience and enough academic skills to succeed in college.In states that require students to pass a high school graduation test, the students are typically given multiple opportunities to take the test each year, over several years.For example, in the State of California, students may take the California High School Exit Exam up to eight times over three years.