[DRIFT_HUNTER]

pawn Код:

public OnPlayerEnterRaceCheckpoint(playerid)
{
    if(IsPlayerInRangeOfPoint(playerid, 10, X, Y, Z)) // First checkpoint cordinates
    {
        SetPlayerRaceCheckpoint(...........);//Next Checkpoint
        return 1;
    }
    if(IsPlayerInRangeOfPoint(playerid, 10, X, Y, Z)) // Second checkpoint cordinates
    {
        SetPlayerRaceCheckpoint(...........);//Next Checkpoint or you can give money or whatever
        return 1;
    }
    return 1;
}

I never worked with checkpoints but i think it will work