Your tutor is pretty good. Maybe this one will be more comfortable for children Ratatype.es

What really helped me improve my typing speed is slowing down. As counterproductive as it may seem, slowing down helps improve your accuracy, which almost directly correlates to your speed. Don't believe me? Check the statistics beneath the quote.

When my fingers hurt after too much time on the keyboard, I, apparently, keep typing, as that is what seems to be going on now. I have typed the letter 'o' too many times in the past ten minutes and my right ring finger is starting to become numb.

My tip to improve your typing speed is to don't get too far ahead of yourself. Go word for word, learn the placement of each letter and learn to type them without rushing it.