Streaming data is a significant part of the exam. I'd recommend to create a few event streaming pet projects to strengthen the core principles of that topic and study that topic from Brian Bonk.
Study Sources: Fabric Dojo by William Needham, test questions at https://certiace.com/ from Aleksi Partanen. I'd say the exam questions are either very easy or very difficult, I used the time saved on the easy questions to spend more on the difficult ones.
I think taking this exam or the DP-600 proves that you have the basic knowledge to participate in architectural or tactical decisions. Knowledge of these topics will help your development experience by providing the context needed to choose the right tools for the job, whether it's optimizing storage costs or defining the correct security boundaries.