We preferably accept internationally recognized English language certificates, such as IELTS, TOEFL or FCE. However, we also accept other kind of certificates issued by recognized language schools where there is an assessment of all the skills (Writing, Listening, Reading and Speaking) based on the CEFR framework of languages (from A1 to C2).
Finally, we accept the attendance of at least one year of secondary school in English Language. In addition, in some cases we can request a Skype interview between the applicant and one of our language teachers.
About IELTS, the minimum overall score required is 5.5
About TOEFL IBT, you can find the table of conversion here: https://www.ets.org/toefl/institutions/scores/compare/