Using the software is the best way before the exams. You used to be able to complete the 3 exams online through an American testing facility in North Ryde a number of years ago, but I am not sure if that is still an option.
Another place you could look at is American Airman in Long Island, New York. I think it different owners to when I did mine, but its certainly another option,as they cater for International students.
Becoming an A&P Mechanic | International Students | American Airman NY
PM if you want more info.