[BigPoncho]

Код:

if(IsPlayerAdmin(playerid))
{
	if (gTeam[playerid] == ADMIN_TEAM)
	{
		if(classid == CLASS_ID_HERE)
		{
		  GameTextForPlayer(playerid, "~r~~n~~n~~n~~n~~n~~n~~n~Admin Restricted", 1000, 3); //Add anything here
		}
	}
	else
	SendClientMessage(playerid, COLOR_HERE, "You're not an admin! You cannot choose this class.");
}
return 1;

Something like that. Change the "ADMIN_TEAM" into the team you've chosen for Admins. Rest is self explanatory. I wrote this pretty fast so not sure if it'll work. It should be in OnPlayerRequestClass.