Question juridique clé
Whether the constitutional complaint against the school authority's letters was admissible.
Solution extraite
The complaint was inadmissible because it was directed against letters rather than an appealable cantonal decision, and any claim of undue delay or refusal of justice was not substantiated.
Motifs extraits
A constitutional complaint lies only against cantonal decrees or decisions; the applicant failed to show a denial or delay of justice and did not meet the reasoning requirements of Art. 90 para. 1 lit. b OG.