Earlier this week, I passed the GPC Associate Cloud Engineer exam. Here are some things that I hope will help others also pass:
Understand the basic structure of CIDR notation (how big or small a range is)
Understand how to separate workloads using VPC subnets and CIDR ranges
Understand how to apply least privilege principle both within the same account / project and across accounts / projects
Understand the difference between service accounts and user accounts and when to use them
Understand how to design self-healing deployments (e.g. GCE)
Understand basic Kubernetes concepts (nodes, pods, deployments – also StatefulSets, DaemonSets)
Understand how to secure credentials in Kubernetes
Understand which data solution to use in given a scenario – e.g. Cloud SQL vs. Cloud Spanner or which Cloud Storage class is most suitable
A lot of the questions were about understanding which solution to use in a given scenario. I would say you can work out the answer to most questions if you understand how GCE, GKE, IAM and the different data storage solutions work.
Hope this helps!