VocabularySpellingCity provides the following sets of correlations to standards:
U.S. Standards by State
Common Core Standards for each States' Implementation
Australian Standards by State
Canadian Standards by Province
English National Curriculum Standards
"Teach reading comprehension with K-6 science, religion, and literary passages all about winter weather, winter life, and winter holidays.
Passages and question sets are research-based and align to Common Core and state standards."