MCD - Integration and API Associate or other base-level exams are meant to verify good base knowledge of a particular MuleSoft product area. The keys to passing these exams are: Possess the appropriate (preexisting) technical skills and study and grasp the course material thoroughly. That almost always means that you've done more than just take the course. You've reviewed the course material, and worked on at least one MuleSoft development project.
The topics covered in the MCD -Integration and API Associate exam are exactly what is detailed in the course description of the Anypoint Platform Development: Fundamentals. We highly recommend attending the instructor-led Anypoint Platform Development: Fundamentals course. We've found instructor led training to be the most effective. Consult the list of training courses.
Download the MCD - Integration and API Associate preparation guide. We've also released DIY exercises and a self-assessment quiz, and included it in MuleSoft.U Development Fundamentals.