How do you say i am a 12 grade student in french?

There are a couple of ways to say "I am a 12th grade student" in French, depending on the context:

Formal:

* Je suis en terminale. (This is the most common and direct way to say you are in the final year of high school.)

* Je suis élève de terminale. (This emphasizes that you are a student in the final year.)

Informal:

* Je suis en classe de terminale. (This literally means "I am in a terminal class" but is understood to mean you are a 12th grade student.)

* Je suis en 12ème. (This is a more casual way to say it, literally "I am in 12th.")

Important note: The French education system is slightly different from the US system, so "12th grade" is often referred to as "terminale". "Terminale" is the last year of high school in France, equivalent to the 12th grade in the United States.

It's best to use the formal versions when speaking to teachers, professors, or other adults. You can use the informal versions with friends or classmates.