[Grim_]

You're somewhat on the right track.
Try something like this:

pawn Код:

new CheckStatus[MAX_PLAYERS]; //Checkpoint to check the players next checkpoint

public OnPlayerSpawn(playerid)
{
  SetPlayerCheckpoint(...);
  CheckStatus[playerid] = 1;
  return 1;
}

public OnPlayerEnterCheckpoint(playerid)
{
  if(CheckStatus[playerid] == 1)
  {
   CheckStatus[playerid] = 2;
   SetPlayerCheckpoint(...);
  } 
  //so on and so on
  return 1;
}