For a head start on getting great reading and writing materials this summer--just look in your mailbox. As the school year winds down and the end-of-year testing and report card frenzy nears, summer looms large. If you have the good fortune to be in a school that isn't year-round, and you aren't working on college credit or at a second job, just picture yourself leisurely having breakfast or lunch instead of gulping it down. Imagine the luxury of poring over the daily newspaper and savoring that stack of unopened magazines and catalogs. Such reveries are good for maintaining sanity in the crush of year-end routines. Getting back to reality, you can double the value of these relaxing activities without missing a moment of your vacation. As you indulge in reading daily newspapers, magazines and even junk mail, you can also stockpile valuable reading and writing materials for next year's students.