To do well in Copy Cat, you must learn to use the "tab" key to switch from one problem to the next. You must also learn to type the numbers using the number pad found on the right side of most keyboards. Don't forget to enable the number lock on your keyboard!
Your goal should be to type every number without looking at the keyboard. If you can do that, you will do well in Copy Cat. If you can achieve a milestone score of 100, you have mastered the skills necessary to type numbers effectively and get the most that you can out of this website service.
After you have mastered numbers (complexities 1-4), complexities 5 and 6 are much more difficult. If you cannot master them, do not worry. Only very skilled typists are capable of completing worksheets accurately at those complexities.