You can obtain all the necessary information in order to pass the E-Series exam if you just plan to take the following NetApp course (is Instructor-based or Virtual Live)
The course is (Configuring and Monitoring NetApp E-Series and EF-Series Storage Systems) or STRHW-ILT-COMNESES
Fast Lane and Qskills they offering this course if you are in EMEA.
In this course you can learn how to configure a new E-Series or EF-Series storage system and establish connectivity with a SAN. How to use the SANtricity® storage management software and CLI to manage the E-Series and EF-Series controllers. You also use SANtricity storage management software features to restore data. Additionally, you learn how to support and monitor E-Series and EF-Series storage systems by performing various troubleshooting tasks, such as evaluating support data and using the built-in tools to identify storage system errors.
The answer is written in the student-guide (FYI: neither is the DAC Store or NVSRAM).