The EU distinguishes two categories of students: students from a Programme Country and students from a Partner Country.
Programme Country students (Category B students) are students originating from one of the 28 EU Member States or originating from the Former Yugoslav Republic of Macedonia (FYROM), Iceland, Liechtenstein, Norway, Switzerland or Turkey.
Partner Country students (Category A students) are all other students, unless they were residents or have carried out their main activity (studies, training or work) for more than a total of 12 months over the last five years in one or several of the Programme Countries. In the latter case, these students are also classified as Category B.
For more details, please consult page 24 of the Erasmus+ Programme Guide.