Friendly fyi: "until" is generally exclusive in English. An similar word that is inclusive is "through". So "I'm on vacation until Monday" implies they will be in the office on Monday, but "I'm on vacation through Monday" implies they will be back Tuesday. I understood what you meant, but for a moment I thought you were saying that you had to pay for highschool in France.
Friendly fyi: "until" is generally exclusive in English. An similar word that is inclusive is "through". So "I'm on vacation until Monday" implies they will be in the office on Monday, but "I'm on vacation through Monday" implies they will be back Tuesday. I understood what you meant, but for a moment I thought you were saying that you had to pay for highschool in France.