I would suggest for anyone trying to do the organic in destroyer to first do those road maps. Then do the organic section. That way you can practice those reactions that you should already know rather then figuring it out 1 by 1.
Just my 2cents.
Also, I would suggest for those of you who have time, to try and do the Exam crackers for organic. It really builds the foundation and then gives you multiple examples of the main points of those subjects.
After reading that, destroyer, and the kaplan organic.. i have yet to score less then a 25 on any practice organic. My kaplan diagnostic put me at like a 12-13 back in may.