Let's go over some additional study resources that cover external technologies required to know for the exam.
SQL deep dive
Course - SQL Primer https://linuxacademy.com/cp/modules/view/id/52
Google Machine Learning Crash Course (free)
Hadoop Quick Start https://linuxacademy.com/cp/modules/view/id/294
Apache Beam (Dataflow)
Google's guide to designing your pipeline with Apache Beam (using Java) https://cloud.google.com/dataflow/docs/guides/beam-creating-a-pipeline