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.
Saludos, MadridMan
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