2-3 hours per night over 4 months is an immense waste of time for 30 SAT points. Even if you wanted to try for the extra 30 SAT points, there should be far more efficient ways to do any needed additional preparation.
In China, university admission is based on a single standardized test that students study extensively for (and it covers more subject material, so there is more to study for). He may be projecting his own experience onto you, even though it is quite different in the US.
In other words, reach or bust. What will he say if you bust (get shut out)?