[Ricop522]

First off create a variable to save the exp and level:

pawn Код:

new exp[MAX_PLAYERS];
new level[MAX_PLAYERS];

After this you can need to create a timer SetTimer to make exp +1 for the player

pawn Код:

exp[playerid]++;

Using the levelup:

pawn Код:

stock nextLevel(playerid){
    return (level[playerid] * 8);
}
if(!strcmp(cmdtext, "/levelup", true)) {
    if(nextLevel(playerid) >= exp[playerid]) {
          // you can have level 2 now!!
          SetPlayerScore(playerid, GetPlayerScore(playerid) + 1);
          exp[playerid] = 0; // reset the variable
          level[playerid] ++; // add +1 level          
    }
    return 1;
}

I hope this help.