Last week I passed for my Intermediate exam and I discovered that outside of the learning paths there is not much to practice with. I made my own flashcards with the knowledge checks from the learning paths and read them side by side with the documentation about the subjects. In the certification overview, you can see the different paths that will be featured: https://academy.mendix.com/link/certifications/22/intermediate
It is allowed to use the paths and documentation while making the exam, which helped me out a lot with a couple very specific questions. Good luck with your Exam!
Thank you very much Patrick!