Duke is an elite university, highly competitive, and it's necessary to complete your high school education with excellent academic standing to apply. While you attend school, it's important to specialize in broad curriculum, high-level classes, as well as supplementing your application with diverse extra-curricular activities and above-average grades.  Take courses in high school that include natural science, 3 years of mathematics, a foreign language, 4 years of English and social studies. Include electives that demonstrate your willingness to be challenged and expand your knowledge base and makes you an erudite. If you plan on applying to the Pratt School of Engineering at Duke, coursework in calculus and physics are strongly recommended during high school. While you may technically apply to Duke having attained a High School equivalency, like the GED, it's very difficult to get into Duke without a nice high school record. It's important to finish High School and graduation with outstanding grades if you want to get into Duke. ake Advanced Placement courses or honors classes, if possible. Duke University looks for students who have taken accelerated classes, and these course may, in some cases, be counted for credit at Duke. If AP courses are available at your high school, find out what it takes to enroll, and do so.  Typically, AP courses are offered during 11th and 12th grade, are somewhat more advanced, and will end with a standardized AP test, in addition to a final. Typically, the AP test itself is optional, but you'll want to take it and do well if you want to get into elite universities like Duke. If you take AP courses and tests, you'll also typically need to arrange to have these sent to the Universities to which you hope to apply. The sooner you know you want to go to Duke, the sooner you can arrange to have your AP scores sent. To get into Duke, you need to display that you've received a well-rounded education and were fully engaged in a diversity of activities at your school. Get involved in a...

TL;DR in Chinese:
完成高中教育。 如果有条件，参加预修课（AP courses）。 参加课外活动。 尽量提高绩点（GPA）。 参加标准化考试。 提交高中成绩单。 需要两位了解你的老师做推荐人。