Yes.... I am doing tactics from Sharpen Your Tactics by Lein and Archangelsky. You can watch my progress on my sidebar. Problems range in difficulty from 1 star-easy 1 movers to 4 stars- hard. The beginning of the book is mainly 1 star problems which goes by quickly. ( I have done this section before).

Level 1 -

Fellow knights here is where I'm at

1st circle problem 142

I have decided that my circles will be problem 1 through 1125 and no mini-circles(subgroups)

Also check this sharp tactic out trying solving without peeking from move 29 with BTM. see position above.

http://www.chessgames.com/perl/chessgame?gid=1468087