Hi,
Unfortunately there aren't too many resources in Spanish; however, what I have found that works is to study with the materials made available in English and work with cases in Spanish - the theoretical portion is mostly the same, the vocabulary may be slightly different / can't be directly translated on some ocassions, and everything else can be practiced / tailored for the interviews.
If you have any other questions or would like to practice a case in Spanish feel free to reach out.
Suerte con tus entrevistas.
Saludos,
Carlos