The ISTQB Certification is monitoring and qualifying for ISQi, it is a German company with ISO 17024 and ISO 9001:2008.
The exam may be taken online in the web page of ISQi (www.isiq.org) and the language could be Spanish or English. For the exam is not necessary take a courses but they are availables in Spanish and English.
The companies accredited for take a courses is named "Courses Provider". About Certifications levels, the ISTQB has three: FUndamental Level, Advanced Level and Expert Level.
The Fundamental Level is to Tester Engineer, Tester Analyst, Consultans, Tester Administrators and Software Developers.This level is to anyone that want to know a basic knowledgement of the Software Testing.
The Advanced Level is to people with profesional experience in Software Test or for anyone who wants to get an intensive understanding of Software Testing.
For the Expert Level not exist available information yet.