Hi Ngan!!!
I think before studying for such a harsh test like the SAT, you should cultivate your grammar first. There are still many blunders in your piece of writing. I just want to point out the best way to learn English for such young kid like you ;) . So no hurt feelings, okie :) . Just do what you can, don't hastily reach for something your physical body and fragile mind could not bear just because a kid sitting near you in class is taking a TOEFL course in "Hoi Viet Mi".
Besides, you're just a kid. Life has more wonderful things for you than just those Critical Reading questions. Instead of engrossed in books and tests, have fun for a change. There are many activities in Ho Chi Minh City, as far as I know ;) . And do I have to say that your application should contain more stuff than just a shocking SAT result.
Gud luck :tup: !!!