Finally, a few tricks that I've used over the years to improve my own touch typing:
Grab a sheet of paper and put it over the back of your hands. It can be very tempting to look down while you type — but that completely defeats the point of touch typing.
Make sure your arms are horizontal with your keyboard. To avoid strain and to make touch typing easier, your wrists and elbows should be on the same horizontal plane, and your back should be straight (which means your elbows should be bent 90 degrees — don't slouch!). If your desk is too high, you can put your keyboard on your lap.
Be gentle. Don't hammer the keys — just push gently. You will know if you're pushing the keys too hard, as your other fingers will come off the keys. All 10 of your fingers should never leave the surface of the keyboard!
Grade 3 - 5 wpm, Grade 4 - 10 wpm, Grade 5 - 15 wpm,
Grade 6 - 20 wpm, Grade 7 - 25 wpm, Grade 8 - 30 wpm.