I am using Ct-art in the following fashion for my Circles. Starting at Level 10 doing a complete circle of level 10 until I hit 90% success. Once I complete 90% i'll move up a level. I think this will prove difficult but I believe that working through the problems I will eventually get it as others have before me I have been using the Practice screen not the test screen. I plan on doing at least 10 problems everyday more when I can. My initial intent is not to accelerate the program too much. Only increasing the problems in a day which naturally occurs from doing the same problem over and over again. (yes this will take a long time). I plan on doing the complete sets of all levels when I have completed them once.