Carol Jago is an experienced English teacher, author, and former president of the National Council of Teachers of English.
Jago writes here about what high school English classes should look like in the Common a core era.
She served on the NAEP assessment committee that set the ratio of 70-30 for test developers.
Here is the key point:
“What seems to be causing confusion are the comparative recommended percentages for informational and literary text cited in the Common Core’s introduction. These percentages reflect the 2009 NAEP Reading Framework http://www.nagb.org/content/nagb/assets/documents/publications/frameworks/reading09.pdf . I served on that framework committee and can assure you that when we determined that 70% of what students would be asked to read for the 12th grade NAEP reading assessment would be informational, we did not mean that 70% of what students read in senior English should be informational text. The National Assessment for Educational Progress does not measure performance in English class. It measures performance in reading, reading across the disciplines and throughout the school day.”
I would clarify further to say that NAEP was not designed to tell teachers what to teach or how to teach. That ratio of 70-30 is an instruction to test developers, not to teachers.