We've recently updated our FAQ and Data Details pages reflecting recent changes and trending questions, including why we recently changed the definition of a senior, why some schools are not listed on the FAFSA, and common errors or misconceptions when analyzing the data.
And what is done against inaccurate data?
Federal Student Aid is providing high schools with current data about their FAFSA submissions and completions so that high schools can track their progress and help to ensure that their students complete a FAFSA.