Passed! Practice exams extremely helpful and a must have.

The practice exams felt similar to the actual exam.
What is a must is to read why the answer is correct and why the others are wrong.
It will help you when you take the real exam when you don’t know the answer but can eliminate some wrong ones.
Also you should hit the links at the end of the questions to get more detail. Reading those taught me some extra info that was not covered as much in the practice exams but was on the actual exam.
Watching some aws deep dives from reinvent on youtube also helped. Watch redshift, emr, glue, and kinesis videos. If you taken other exams like the SA Pro, then some topics are easy to review like S3, RDS, DMS, and lambda.
Next, Machine Learning and I see that there is a data engineering section that covers what I just learned in Data Analytics.