How do you say in french want to take the delf test?

There are a few ways to say "want to take the DELF test" in French, depending on the level of formality and the specific nuance you want to convey:

Formal:

* J'aimerais passer le DELF. (I would like to take the DELF.)

* Je souhaite passer le DELF. (I wish to take the DELF.)

Informal:

* J'ai envie de passer le DELF. (I feel like taking the DELF.)

* Je voudrais passer le DELF. (I would like to take the DELF.)

More specific:

* Je voudrais passer le DELF A1/A2/B1/B2/C1/C2. (I would like to take the DELF A1/A2/B1/B2/C1/C2.) (Replace the level with the appropriate one)

To sound more natural, you could also add a bit of context:

* Je voudrais passer le DELF pour améliorer mon français. (I would like to take the DELF to improve my French.)

* Je pense passer le DELF pour mon travail/mes études. (I'm thinking of taking the DELF for my job/studies.)

Remember to choose the appropriate expression based on the situation and the level of formality you want to use.