The best I know I think would be the DELF – a certification of French language abilities
DELF for short, is a certification of French-language abilities for non-native speakers of French administered by the International Centre for French Studies (Centre international d’études pédagogiques, or CIEP) for France’s Ministry of Education.
Others non-official alternatives if needed :
I agree, the best if the DELF. If you’re looking for a French language school in France I can recommend you this one : https://www.cia-france.com/
there are some lessons about DELF.
good luck
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