I'm trying to find a book that has good exercises for warm-up, accuracy, & technique. I do not have a lot of time to practice, especially during the week, but am trying to find some exercises I can pick up at the end of the day to help keep my skills sharp. I don't necessarily need to learn anything new, although always open to it, but just need something to keep me going. Although not necessary, a bonus would be if it were in standard music notation to help improve my sight reading skills. Any recommendations?