For today's Octaves, play the exercise your teacher has assigned for you in your String-O booklet, or if you don't have a String-O exercise booklet, you can use this example sponsored by C. Harvey Publications. Any of the exercises in the Octaves book from C. Harvey Publications qualify for the Octaves box on your String-O game board.
This snapshot comes from the book Octaves for the Violin, Book 1. If you are looking for a good work out for your left hand, I highly recommend this book!