The UNAM is Mexico’s biggest and most important university. To enter it students must either take an exam or graduate from a high school run by the UNAM in less than 4 years with a grade point average of at least 70% (although some majors like medicine require 90% for pase directo). The admission exam is given twice a year, in February and June, and any student from any high school with at least a grade point average of 70% can take it. If the student meets the requirements for entering the UNAM, passing the exam guarantees him admission. The exam has 120 questions.

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In Mexico City all ninth graders who want to enroll in a public high school (grades 10 trough 12 in Mexico) must take an exam called COMIPEMS. In order to ensure students are assigned in a fair way to a school of their choice the following steps are taken: