Your brother went to your high school and then studied abroad. Surely there are other students from your high school who have done this as well. Get in touch with them, and create your own database of admits if your guidance counselors are useless.
You also could seek advice from the AMIDEAST office closest to where you live. The counselors there will know where students from your country have been admitted and what their profiles were like. https://www.amideast.org/