[akis_tze]

Take a variable for the player
Example: Make something like that

when the player type /licenseexam
make his variable 1 => CP[playerid] = 1;
and set a race checkpoint

after that do something like that:

public OnPlayerEnterRaceCheckpoint(playerid)
{
new CP[MAX_PLAYERS];
if(CP[playerid] == 1)
{
CP[playerid] = 2;
DisablePlayerRaceCheckpoint(playerid);
SetPlayerRaceCheckpoint(playerid,);
}
else if(CP[playerid] == 2)
{
CP[playerid] = 3;
DisablePlayerRaceCheckpoint(playerid);
SetPlayerRaceCheckpoint(playerid,);
}
And continue ....