Cheated students are everywhere. Public and private schools that hire unqualified teachers cheat students. Universities that use internships to generate funds while collecting tuition cheat students. Professors that charge fees for special 'test preparation' courses cheat students. Government agencies and companies that 'sell' jobs to recent graduates cheat students. Foreign universities that recruit Chinese students for palliative 'international programs' cheat students.
Students that cheat on tests are merely adaptations to the tacit values of their educational system.