the answer of keule306 is correct to some aspects but its still wrong. the two thing that u need is ZBOT+ and the trainer of "987654321(author)" version 1.2.9.
here's how to do it :-
1) start trainer and bypass the anti cheat system using "shift +f1"
2) then "ctrl + f5(heat level 5)" "ctrl + f6(no cops)"
3) choose any pursuit from map and start it .then start the zbot .....
u r done then get a beer or coffee and start to watch tv coz the bot will get u level up.....................
note :- just use it to level up like 3 levels per day or u are gonna get banned...