CCDAK exam preparation - Suggestion Required

Currently, I am preparing for my Certified Developer for Apache Kafka CCDAK exam. I collected knowledge from experts by joining online forums and communities. I took the Confluent Certified Developer CCDAK practice test and it was beneficial. By practicing with this practice test material, I saw a huge development in my concepts related to the final exam. I found this practice test helpful. Now I can take the final test with confidence.
Does anyone want to share other resources regarding Confluent CCDAK exam preparation?