<p>Yes I am from Asia.
Initially, my Math was ok and I constantly scored a 800 with no sweat. My Writing and CR (especially CR) were not so good. With regard to Writing, I realized that there was no shortcut and learned all about the rules and styles in the SAT. I found The Seven Deadly Screw-Ups by SparkNotes really helpful. With about 3 practice tests or so, I was able to raise my score from the low 600s to 750+.
Now, about CR, there are lots of tricks that you’ve probably heard of. Aware that you’ve got the Black Book, which is the revised version of Grammatix by Michael Barrett, I adivse that you stick with the strategy in that book. When I first used the strategy summarized from many sources, my CR score only increased to the high 600s, never above 700. Then, I took the advice from one guy who scored an 800 on the real test to take the hard way and not solely rely on those tricks anymore. I became a “critical reader”, engaging myself with the passage every time. The result turned out great: my score rocketed to above 750 and the only problem left was that I kept missing one or two sentence completion questions. I bought the Direct Hits (recommended by A LOT of people) and alas!, I never got more than 3 CR questions wrong again.
As I said, I took the official SAT last Saturday and I am expecting to receive a 750+ CR.</p>