How much chances does subject test boost?

Test Preparation
1

<p>The November SAT II result is just released, and I got all 800s in Physics, Chemistry and Maths II.
I sat for October SAT I for the first time, and received a mediocre 2030.</p>

<p>As an international, how much chance is boosted for a top college in the US for the SAT II?
Or in other words, how well should I perform in December SAT I to at least be above-averagely competitive for top colleges, provided that I am of only about 10~15% class rank and no special ECAs?</p>

2

<p>bump…</p>

3

<p>bump2…</p>

4

<p>bump3…</p>