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How to prepare for ECAT

Hello everyone. I'm new comer. I come from Vietnam. Actually I'm just a highschool student now and I plan to enter an Engineering college in USA. I'm going to take ECAT test, I don't know how to prepare for it and I hope to receive some help.
Could you please suggest me some names of books that are useful for revision? (As this test is not popular in my country so it is very difficult for me to find some sources of materials.)
Could you please suggest me some names of books that are useful for revision?I asked the same question on several forums, and I receive some advice that I should install STEP by PGC. Have you used it? Is it good and reliable? Are its questions are the same with those in ECAT test? (no need to be exactly the same). I have taken some online tests but I think they are not enough. I need more.And do you know some online course? (If yes, how about their price and quality?)Thank you very much.
I'm really eager and hope to be an exchange student.