By the end of year, read and comprehend informational texts, including history/social studies, science, and technical texts, in the grades 2-3 text complexity band proficiently, with scaffolding as needed at the high end of the range.

This standard is pretty much a copy of its Reading: Literature counterpart, so take a look at what we have to say about this standard over there. Just replace anything related to literature with non-fiction as you read.