I'm education advisor at Ratatype.com (http://www.ratatype.com/) - online typing tutor for kids and adults.
After signing up, you will get access to all typing lessons and exercises. You can see speed and accuracy for every lesson and exercise there and improve your weak sides.
I ask teachers to take a close look and provide me with any suggestion that will make the tutor more comfy for teachers and students.
Thanks a lot for your time.
P.S. Recently, we completed the infographic about average typing speed and accuracy at http://www.ratatype.com/learn/average-typing-speed/ . Hope, you will find it useful for yourself.