Do you think you are one of the top students in your country? I mean, seriously, you have to have an idea if your school has sent a number of students on to top US colleges in the past. You should have some idea of the better schools in your country and if your school is one. Even though your school doesn’t rank, you should have some idea if you are one of the top students (among the top 10? The top 20? In the middle of the pack?). You mention that you don’t have any major awards but have distinction in the benchmark test. How many others earned the same distinction and is there a higher recognition level than that?
Where I live, everyone knows the “best” schools - the expensive private ones, the public ones with the best course offerings, the ones with a reputation for sending students to the top colleges. In our school, everyone knows who is a National Merit Finalist, who takes all of the AP classes, who the football MVP is, who won a poetry contest, etc.
The issue is your application will be judged along with all of the applications from your country and the admissions staff will select 5 or 6, or maybe 4 or 7. In order to be one of those, you need to be among the best few in the pile. Others will come from the best school, have better grades, won more awards, or have more money. The key is knowing where you fit in.