Officer Bolian has a good back. Candidates for the master's degree in police affairs are all on-the-job policemen. It's hard to take the postgraduate entrance examination while working, and there is often not enough time to prepare for the exam. Bolian Education has sorted out the outline analysis, core madness and other materials for police masters, summed up the main points of postgraduate entrance examination, greatly improved the efficiency of preparing for exams and saved the time for preparing for exams, which is undoubtedly a good help for on-the-job police.