The term "class", in the first degree, generally corresponds to a group of academic students in the same level during a school year.
In elementary school, the class corresponds to the course (preparatory course, elementary course, 1st or 2nd year, 1st or 2nd year intermediate); these classes may be called "single level classes". However, in some schools, the number of pupils is such that students from various levels are grouped in the same class; this is a "class with several levels". Some schools have only one class, also grouping together several levels; we then speak of a "single class".