Tamagotchi School , also known as TamaSuku , is the newest Tamagotchi available in Japan, being released November 23, 2006. It is the second Tamagotchi that is horizontal, first being Arukotch. It also is the first Tamagotchi to use a directional pad, and the second Tamagotchi to have only "select" and "cancel" buttons, the first being the Yasashii Tamagotchi. It can connect to other Tamagotchi Schools for playing games, the Entama and Uratama to move in new students and exchanging "Gotchi Points", Tamagotchi Station, Tamagotchi Station 2, the "jukutama" (a Deka Tamagotchi for Tamasuku) and an interactive website where players can compete against other players.
The goal of Tamagotchi School is for the user to make their class a "supreme class" by enrolling new students, keeping up their popularity, and increasing their score in three main subject areas: National Language (i.e. Japanese), Arithmetic, and Science. Just like the three different skill areas of the Entama, Uratama, and Hanerutchi 2, players can increase these by playing games or buying stat-boosting items.
Thats from wikipedia.
Several people on here have them so if you search you can read what they have to say about them.
Here is Kat's(Mimitchi) section on them: http://www.mimitchi.com/tamasuku/index.shtml
I think as of now they're only available in Japan, but you can buy them on eBay.
Welcome to the forums, by the way.