Do international students have a higher chance of getting into...

...good colleges in the US? Okay I'm currently about to begin my 12th grade in India. I did really well in 11th grade. My average percentile was 95 % and for 10th grade it was 90 %. Unfortunately I didn't do so well in 9th grade. My average percentile was an 85%. As for my extra curricular activities I did a lot of volunteer work. But I didn't take part in many school activities. And I got a 2300 on my SATs. I really want to get into Washington University in St. Louis. I was wondering if I have a chance in getting in. I am an international student. And someone told me that because I am an international student I have a higher chance in getting in. Is this true or am I completely off?