Please be patient waiting for replies.
I would think you need to talk with admissions department at the college of your choice to find out which if any of your international credits will transfer to their program. Every school is different.
Once you find that out, they will be able to recommend preparation courses.
This link may help:
FAQs for International Nursing Students in the U.S. | All Nursing Schools
Also, these are the google search strings I used, try:
nursing in usa requirements
international bachelors of nursing
ETA: Sour Lemon's response makes sense, too. I was thinking you would need to take the NCLEX after graduating and getting an Authorization To Test from a US school, but maybe that isn't the case.