This is currently the quickest way to see what is taught at each level in the NGSS. Clicking on a topic in a grade opens the standard to see the performance expectations, and that will help a teacher know what and how to teach that standard.
On this NJ DOE Science CCCS Resources page, scroll down to the section titled "Language, Literacy, and Learning in the Content Areas" to see Connections documents that will help you understand the Next Generation Science Standards.