How Do "Good Works" Factor into Salvation?

The struggle between works-salvation and faith-salvation is one that I find many Christians grapple with. Like it or not, many in the church pew tend to think that their ticket to heaven gets upgraded based on how many good things they can do for the world and other people. And don’t get me wrong, sometimes I get in my head like that too because this whole world runs off of a performance-based lifestyle. How many likes can I get on this post? How can I excel at work to get a promotion? How can I excel at school to get good grades?