If you are ready to tackle DCAUTO, here is your roadmap to passing.
The exam will ask you scenario-based questions. For example: "You need to automate a one-time configuration change across 500 switches without installing a new agent. Which tool is best?" You need to know the strengths of Ansible (agentless) vs. Python (custom scripts) vs. Puppet/Chef (agent-based) to answer correctly. 300-635
Utilizing Git for version control, understanding REST and RPC API styles, and interpreting Python scripts. If you are ready to tackle DCAUTO, here
Let me know which context matches your need, and I can customize it further. Which tool is best
To pass, you need to be comfortable with four major areas. Do not ignore any of them; the exam is balanced.
The exam is challenging because it requires a shift in mindset. You are no longer just configuring network topology; you are writing logic to define that topology.