Hello Silvia,

According to Marina Orellana's International Glossary:

Executive decree: acuerdo presidencial; decreto supremo
Decreto exento: (Chile) exempt decree (exempt from review as to constitutionality and legality)

Anyway, I have seen plenty of references to 'Supreme Decree' on the Web, some of them belonging to sites of the Chilean government (example: www.concesioneschile.cl/web_ingles/marco_legal.htm). More info about what 'Decreto Supremo' means in Chile:

Decreto Supremo, Supreme Decree - a Supreme Decree is signed by the President of the Republic or a minister on behalf of the President. It is issued in accordance with a law previously approved by the Congress. It is an instrument to describe one or many aspects of how a law will function. It takes effect and has the power of the law upon publication in the Diario Oficial (Official Gazette)
can-chil.gc.ca/English/Resource/ Reports/ChileEM/ChileEM_1.cfm

So a 'decreto supremo' can be enacted by the president or a minister on his behalf. Thus my sugestion would be 'Exempt Supreme Decrees by the Ministry of Education' or 'Exempt Executive Decrees by the Ministry of Education'. If you are uncertain about who has actually issued the decree, 'Exempt Supreme Decrees on Education' copuld be an option.

Regards,

David