This is the third system I recommend. There are 9+1 books. 3 books each level: build, boost, and evolve. The 1 extra book is level 1 test. According to the Introduction, the books are for 1500, 1800, and 2100 level players. They are for advanced players. This is also the natural extension of Steps course. One could try this after s/he finishes at least Step 4.
Here are the books:
Here are the books:
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