Instead of reading the ACS from page one to the end, use it to organize your preparation. Identify each task, then ask yourself what knowledge, risk-management thinking, and performance the task requires.
Use it to find gaps
For every task, ask: Can I explain the concept? Can I apply it in a scenario? Can I identify the risks? Can I perform the associated skill to the required standard?
Practice explanations
An oral exam is not a multiple-choice test. Practice explaining your reasoning, especially when a scenario changes.
FlightFoundry approachWe use the applicable FAA ACS or practical-test standard as the framework for one-on-one instruction and checkride/oral preparation.