Second, if you want to teach in a university, you should pay attention to one or two universities in the midwest or two or three universities in the east.
Third, I don't know what your scientific research results are like, and what about your papers, funds and projects? If you feel particularly good, you can rush up. If it is average, it is recommended to follow the second rule.
Fourth, it is not too late to be a foreign lawyer, but now you are basically required to have work experience. After all, there is still a big gap between theory and practice. So, if you don't have relevant experience, you don't actually have an advantage.
Fifth, the public security law, it is natural to take an examination of civil servants, but the competition among civil servants is also fierce, or it depends on whether you are ready.
Above, complete your answer and wish you all the best.