How to win a scholarship?

Context: I am a Latin student who is in the last grade, in my country I had an outstanding performance in one of the best schools in my city.Unfortunately, because of how deplorable education is in my country, I did not acquire any benefits, now in the United States I want to achieve great goals both for myself and for the country, but I do not have the Knowledge of the subject, someone guide me on this, thank you very much