Translation of rosca

I have contacted you 12 months ago to propose your school's inclusion in our language school directory. I wanted to inform you that our site achieved high positions in search engines last month.
Choosing the right language school is not an easy task. If you want to learn Spanish for example, you first need to know which country you should visit, because the pronunciation in each country differs.
Maybe it's just a small mistake but I think that we corrected almost all errors. But I'm not worried anyway, because you already have good language skills. Good luck with your exams tomorrow.