Running under the "Le progrès lycéen" lists, the MNL secured around 22% of the vote in the 2018 Conseil Supérieur de l’Éducation high school elections, placing second among student organizations.

[3] In 2017, the UNL-SD opposed a reform of the Baccalauréat, particularly criticizing inequalities it believed were introduced by continuous assessment and the loss of anonymity during exams.

The union also opposed the creation of Parcoursup, criticizing the platform's selective algorithm, its lack of ranking for applicants' preferences, and the drastic reduction in the number of choices available to students.

The MNL called for high school blockades and urged students to join citywide protests during the national strike days.

[12] The MNL also used these protest days to reiterate its opposition to Parcoursup, mandatory national service (SNU), and the LOPMI law.