From the info at the following link it is grade 7 as ElizabethN said. The E denotes it is aligned with common core standards from what I read.

http://www.riversidepublishing.com/products/ia/pdf/Iowa_Scope_Sequence.pdf

Congratulations greenlotus. I have followed your recent posts. All the more impressive. No wonder the school is finally sitting up and taking notice. I am very pleased and relieved for you. I know it has been a stressful time!