This course will teach you the techniques of hacking systems that you'll need for the 312-50 exam
System hacking is one of the most important, and sometimes, the ultimate goal of an attacker. In this course, Ethical Hacking: System Hacking, you'll learn the different techniques attackers will use to breach your systems. First, you'll explore the hacking methodology that attackers use. Next, you'll discover gain access and escalate privileges. Finally, you'll learn how to maintain access to the targets you've "pwned". When you're finished with this course, you'll have the skills and knowledge of an ethical hacker needed for the 312-50.
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https://www.pluralsight.com/courses/ethical-hacking-system-hacking