Here is a printable that you can give to your students, which will help them to graph their weekly spelling test results! Each set contains the most commonly sized spelling lists - a graph for 10, 15 and 20 words. I have found that students achieve the best results when they can see themselves improving, and have to physically colour in a graph each week. They love trying to beat their score! This is great to put into their portfolio or take home folder so that parents (and students) can see their progression throughout the year. I refer to these in Parent / Teacher interviews, as the data really speaks for itself!
I encourage you to give it a go and see your students succeed!