This question words all jumbled together. It needs to be rewritten in a manner that is understandable. After this is done, then it can be answered properly.
One can find Gakuen Hetalia plushes at a limited number of outlets. They may be available at Pony Tail, Hetalia Item Guide, or on auction sites such as eBay.
It can be found only in fanfiction and roleplaying sites.
Yes, there is a video game based on the Hetalia series called "Hetalia: Axis Powers - Paint it, White!" It was released for the Nintendo DS in Japan and later for iOS and Android platforms.
Baruto no gakuen - 2006 is rated/received certificates of: Germany:12
Kamen gakuen - 2001 is rated/received certificates of: Germany:12 South Korea:15 UK:12
Sentou Gakuen happened in 2012.
Gakuen Heaven happened in 2003.
Kinmon Gakuen was created in 1911.
Ichikawa Gakuen was created in 1937.
Todaiji Gakuen was created in 1926.
I wish and hope but I highly doubt it will. It would be reasonable if they release games in English if a majority of youth would want to but it. Not everyone likes Hetalia, most in US/UK haven't even herad of it because there too busy playing bloody war games, EX: Men. But if we try hard enough to pursuae them to release it in english, maybe they will.
The duration of Baruto no Gakuen is 2.23 hours.