Only seniors are eligible to take TEM-8, unless your friend is in the spring class. You can take TEM-8 in the junior year, but as far as I know, there is no spring class in China Normal University, so your friend can only wait until the senior year to take TEM-8.

Moreover, there are many restrictions now. In the past, many professional students could take the TEM-8 exam, but now the Ministry of Education seems to have issued a new regulation, limiting only English majors to take the exam. You can call the Academic Affairs Office of China Normal University for details.