[MadeMan]

pawn Код:

new Class[MAX_PLAYERS];

public OnPlayerRequestClass(playerid, classid)
{
    Class[playerid] = classid;
    return 1;
}

public OnPlayerRequestSpawn(playerid)
{
    if(Class[playerid] == CLASSID) return 0;
    return 1;
}

This won't let player spawn with the classid you want.