As an international student who havent been educated in US, I wonder if the blue book is enough for getting a very good score. Can I have a 2300 only with studying that and learning the words inside? If not, what other materials do I need?
I think it’s possible, maybe pick up a few specific books for each section if you have weaknesses in CR, Math, or Writing.
The Blue Book was essentially all I used to prepare. I think I also picked up a vocab book, but I didn’t look at it much.
If English is not your first language, it might also help to learn common Greek/Latin/other roots that many English words (e.g. euphonious) come from. However the best vocab practice is simply reading/practicing English every day.