bring within a range
bring (something) within a/the range
To adjust or improve something so that it meets a certain requirement or expectation. An adjective is often used before "range." You need to bring your students' standardized test scores within the acceptable range for their grade level.
bring something within a range
to adjust something into a particular range; to adjust a parameter. Let's try to bring your cholesterol within the normal range with diet. It was brought within the normal range by an expensive drug.