Hello. I am an IMG in Korea trying to gather information for my test prep for step 1.
from all the info I have gathered so far, I have been considering:
Kaplan online prep course
DIT step 1
because I feel like I need some push and guidance from video lessons.

I am also considering buying these books :
First aid step 1
Goljan pathology
High yield Neuroanatomy

How does the DIT differ from Kaplan online prep course?
and Are there any other musts/suggested books that I need to buy
for the step 1?

Basically all the information I have gathered are from these two pages:
http://mdjourney.com/how-to-study-for-usmle-step-1
http://jeffline.jefferson.edu/Students/USMLE/resources.html