new detskills = PlayerInfo[playerid][pDetSkill], detlevel;
new truckskill = PlayerInfo[playerid][pTruckSkill] , trucklevel;
if(truckskill>= 0 && truckskill<= 50) trucklevel= 1;
if(detskills>= 0 && detskills<= 50 ) detlevel = 1;
{
format(string,sizeof(string),"Detective Level: %d - (%d  more times to level up)",detlevel,51 - detskills);
format(string,sizeof(string),"Trucker Level: %d - (%d  more times to level up)",trucklevel,51 - truckskill);
do other part same as i showed you here.