Hi, jacmom! Are you asking about the Cambridge Exams throughout Spain or just in Madrid? I believe they have offices throughout the country, but the biggest one and the headquarters is in Madrid.
I can tell you that if you have residency - which is a requirement of some type, there is work to be had, but only in the springtime. The pay is about 25 Euros per hour and one might work an average of 2 to 3 hours per exam, but only a few exams per week unless you are available every day of the week.
The Cambridge Exams are generally administered by the BEDA program and it is BEDA (FERE-CECA) which employ/pay the examiners, not the schools.
While I'm not certain, I believe foreigners with a student visa can work a certain number of hours per week/month.
I can also tell you that the training period for most Cambridge Exams is nearly over so if you know someone
who wants to get in, they'd better apply immediately.
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