recent master’s grad looking for job

just graduated with my master’s in marketing research and i’m doing all the right things it seems for the job search - prepping for interviews, reaching out to people, etc. i’m currently in the interview process for only one company, but i’m scared of the case study round. how do i effectively prepare for this - looking at some data and then synthesizing insights? i failed case study rounds before, so im pretty scared. i feel like my master’s program didn’t prepare me for these, and my classmates have been saying similar things about their experiences. are there any websites or people i can reach out to for this?

also what are some certifications that would be good to get in the meantime in the MR industry? any help with any of the above is much appreciated, including any general job search advice for a recent grad. thanks:)