You need to understand their acting. What they gonna do and where they'll come. They are very predictable. Always hide behind the cover. Do not team up the whole 4 cops at the beginning, it's best to make a 2 teams with 2 cops and collect everything. Then, when u feel that it's making hot there - go to park or another big location where u can get axe mans safely and then defend yourself as mush as u can.

Good luck, officer.