Early leaver from education and training, previously named early school leaver, generally refers to a person aged 18 to 24 who has finished no more than a lower secondary education and is not involved in further education or training; their number can be expressed as a percentage of the total population aged 18 to 24.
For Eurostat statistical purposes, an early leaver from education and training is operationally defined as a person aged 18 to 24 recorded in the Labour force survey (LFS):
* whose highest level of education or training attained is ISCED 0, 1, 2 or 3c short;
* who received no education or training in the four weeks preceding the survey.

Source: EU commission (Eurostat) 2016, Europe

(Low-achieving school leaver) those who left regular schools or special schools for students with learning disabilities without or with only a lower secondary school degree
Source: Solga 2015, International