The grade sistem in Brazil is different so it´s kinda complicated to fill this part. If possible l´d like some tips about the whole filling process too. Thanks!!!
Here's a link to a US GPA calculator from international grades. I'm not sure if it will tell you what the grade for each individual class would be or just your overall GPA through
https://myiee.org/gpa-calculator.php
If it doesn't give you individual grades for each class, here is a US grade calculator from Brazilian grading systems (it should hopefully have yours on it)
https://www.scholaro.com/pro/Countries/Brazil/Grading-System
As for general tips, I'm not really sure if there are any. You could try asking counselors or teachers at your school for help though, or at least have them double-check to make sure the grade conversions look correct :) Good luck!
To keep this community safe and supportive:
If you have any more specific questions about the application feel free to ask!