Nations games are open only for one day of the week , Wednesday (great idea, isn't it ? )
So whatever you do it's only for 24 hours.
No matter if you played vs 1 or 3 teams, if you didn't won, you get 0 points.
Next week now.

* the only thing you can do is a full training at Tuesday so to have a 8% bonus in Wednesday.
Of course you can do a daily training every day but it's useless as most of the players are old and slow trainers, opponents have relative quality with your team and the games have mostly random results.