US colleges know the French grading system. Basically anything 14+ is an A and while the Top 25 hope for a mention TB they don’t just focus on this. They want your class rank (basically, if you’re aiming for a top 25 university/LAC you better be the best student they’ve had in years, or be at least the best in your whole filière).
But what matters MORE than 14. v. 15. 17 is what you do in your limited free time. You can’t just be at home doing homework. You should be out changing the world, making a positive impact in your town or neighborhood, training to be the best in a sport or a musical instrument or chess…
Take the ACT, French students tend to do better on this (the questions are more straightforward and the questions match the French curriculum a bit better).
Typically, French students are trained at analyzing elegantly and the SAT/ACT ask you to check something quickly, so they often do very badly compared to what their French grades would let one expect. Overcoming that handicap is going to take hard work. If you score below 1400 many meet need colleges won’t be within reach, nor merit scholarships.
Being at the end of 1e, you’re already “late”, in that the students I work with tend to start working toward their goal in 2e. Most of your activities are already set so if you haven’t spontaneously done something extraordinary on your own, it’s going to be tough.
Get a Princeton Review’s Best Colleges. This book contains roughly the top 10% of colleges. Start reading.
There are 3,700 colleges in the US, so Top 100 National Universities and Top 125 National LACs + Top 10-15 Regional universities in each region are excellent (from above Grande Ecole to Grande Ecole to excellent IUT/Ecole/Prepa).