[Flake.]

https://sampwiki.blast.hk/wiki/GetPlayerScore

PHP код:

public OnPlayerEnterVehicle(playerid, vehicleid, ispassenger)
{
    if(GetVehicleModel(vehicleid) == HUNTER_ID) //Change this to the hunters vehicle id
    {
        if(GetPlayerScore(playerid) != 5) //If the players score isn't equal to 5 it'll kil them out 
        {
            RemovePlayerFromVehicle(playerid); //Kicking them out
            //Add more messages here if you want
        }
    }
    return 1;
} 


Theres several ways of doing it, that's just one simple example