At the end of a completed course, you receive a HOLANGCOURS certificate of completion. Here is exactly what it is worth.
"HOLANGCOURS is a language teaching service published by EUDUC. It is neither an examination centre nor a centre accredited by a certifying body. The certificates it issues are aligned with the CEFR and attest to a level assessed internally; they constitute neither a State diploma nor a certification registered with the French RNCP or Répertoire spécifique.
Official examinations are administered exclusively by the bodies accredited in each country."