Recommend me WW1 and WW2 games .

History Channel: Civil War!

Hmm... Medal of Honor (all of them BEFORE Airborne), Brothers in Arms

Red orchestra 2 : Heros of Stalingrad.

Day of Defeat:Source

Call of Duty: World At War

Any good WW1 games with a nice single player storyline?

Order of War its strategy tough

Wolfenstein. It's very realistic, I tango'd with robot hitler once.

commandos

Company of Heroes.

Hearts of Iron is what you need.
If you're up to the task of controlling every aspect of a nation through a grand strategy game.
And beware; Not for beginners!

Red Orchestra 1 & 2. But I heard 2 was kinda hardcore.

Empire Earth(The German Campaign and the US Campaign in the Expansion) The Objectives screen comes with a History lesson. It's a RTS.

If you love multiplayer, than try Cod5, best multiplayer from COD series

If you love simulating -> best is red orchestra 1

Plants vs Zombies helped me become a better gardener as well.

fortix better then anyother game try that

Well, for the WW2 it's Blitzkrieg series for sure, they have a lot of info on weapons. (RTS)

Brothers in Arms: Road to Hill 30 + Earned in Blood - but you will have to beat it few times to open all of historical materials. And this is the only FPS, where Normandy is not a Hollywood styled battle, because it was not, lol. But anyway, it's still a game.

Btw, 'how easy History (as a subject in school) was for him becouse he played a lot of the call of duty 1-2-3'. Oh my God, this game is a one big fucking lie about the War! O_O

This may be a bit old, but Battlefield 1942. There was even a WW1 mod out there, I think it was called Battlefield 1918.

Maybe Battlefield 2 with Forgotten Hope 2 mod ? Overall I think you should try Red Orchestra 2

Play the first 2 or 3 CoDs, then watch Band of Brothers, that should give you a great jump start on WWII history.

The Close Combat games for WWII. Not sure if there really was any WWI games made aside from Iron Storm, and that was just a fantasy game with no historical accuracy

Order of War, Operation "Blitzkrieg", Blitzkrieg 1-2, Silent Storm, Operation "Europe".

Day Of Defeat:Source

RO2 is accurate but its just about the Eastern Front, the battle of Stalingrad to be specific.
COD1 and COD2 include a wider range of battles.