In most schools, the school week consists of days Monday through Thursday or Friday.
However, in some countries (such as France

France

The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

) it goes from Monday to Saturday. There is no school on Sundays, and some afternoon classes may be cancelled or skipped. A few schools are cancelling Fridays, due to fuel

Fuel

Fuel is any material that stores energy that can later be extracted to perform mechanical work in a controlled manner. Most fuels used by humans undergo combustion, a redox reaction in which a combustible substance releases energy after it ignites and reacts with the oxygen in the air...

 costs. In Japan the school week is Monday to Friday (though the majority of students in Japan go to school on Saturdays and Sundays for test preparations, athletics

Sport

A Sport is all forms of physical activity which, through casual or organised participation, aim to use, maintain or improve physical fitness and provide entertainment to participants. Sport may be competitive, where a winner or winners can be identified by objective means, and may require a degree...

, etc).