[zowzow]

PHP код:

forward PlayerCheck();
public PlayerCheck()
{
    static
        str[128];
        
    foreach (new i : Player)
    {
        new exp_max = 50 + (Player[playerid][Level] - 2) * 50 + 50;
        
        format(str, sizeof(str), "%d", PlayerInfo[i][pLevel]);
        PlayerTextDrawSetString(i, pTextDraws[i][4], str);
        format(str, sizeof(str), "(%d%c)", PlayerInfo[i][pExp], '%');
        PlayerTextDrawSetString(i, pTextDraws[i][3], str);
        PlayerTextDrawTextSize(i, pTextDraws[i][1], PlayerInfo[i][pExp]*1.09, 15.749994);  // max progress = 109.559906
        
        PlayerTextDrawShow(i, pTextDraws[i][1]);
        if(PlayerInfo[i][pExp] >= exp_max)
        {
            PlayerTextDrawTextSize(i, pTextDraws[i][1], 0.0, 15.749994);
            PlayerTextDrawShow(i, pTextDraws[i][1]);
            PlayerInfo[i][pLevel]++;
            PlayerInfo[i][pExp] = 0;
        }
    }
    return 1;
} 


Here is the code
Level 1 = 50 exp and *2 after every next level