ENGLISH TEACHER

We are looking for a native English-speaking teacher for our children (ages 14 and 11). They have a very good level of English, as they have had English-speaking babysitters for many years, but we want them to continue learning and to prepare for some Cambridge exams.We live in Gracia (Barcelona). The schedule would be:
Monday	17.30-18.30
Tuesday	17.30-20.30
Wednesday	17.30-19.30
Thursday	18.45-20.15
It would be like 3 hours per week with one kid and 4 hours with the other kid.