Michelle Anderson, founder of Clarinet Mentors (www.learnclarinetnow.com), presents a lesson on five basic clarinet technics that improve high notes. There is a worksheet to accompany this at: http://www.clarinetmentors.com/resources/HighNotesWorksheetVideoOneofThree.pdf
For more videos in this series that get more advanced, and answer your clarinet high questions, go to www.masteringclarinethighnotes.com