Case C-431/22, Scuola europea di Varese: Judgment of the Court (Second Chamber) of 21 December 2023 (request for a preliminary ruling from the Corte suprema di cassazione — Italy) — Scuola europea di Varese v PD, as person exercising parental responsibility over NG, LC, as person exercising parental responsibility over NG (Reference for a preliminary ruling — Convention defining the Statute of the European Schools — Article 27(2) — General Rules of the European Schools — Articles 62, 66 and 67 — Challenge to the decision of a Class Council not to authorise a pupil to be promoted to the year above in the secondary school — Lack of jurisdiction of the national courts — Sole jurisdiction of the Complaints Board of the European Schools — Effective judicial protection)