B1 and B2 are two levels of language ability set out in the Common European Framework of Reference (CEFR). If you wish to know more about the CEFR click here.
These are the levels that students are required to prove in order to receive a degree or a post-graduate qualification from any university in Andalusia. Likewise they are the levels that the University of Granada demands of non-native-speaking students if they wish to attain a place on a degree or post-graduate course.
To accredit level B1 or B2 in Spanish you must have a Diploma or Certificate obtained by passing an official test of mastery in Spanish at B1, B2, or a higher level.
One option is to take the Examen de dominio de español en línea del CLM. The Centro de Lenguas Modernas offers the chance to attend in-person exam preparation courses.
Another option for accreditation is through the Instituto Cervantes DELE exam. CLM, which is an accredited Cervantes exam centre, also offers the possibility of taking the exam and attending exam preparation courses.
The language courses you have done previously will not necessarily be sufficient to accredit your level B1/B2. Certificates obtained by following courses will not serve as accreditation. Only passing an official test will be sufficient.
You should plan your accreditation with enough time if your level of Spanish is not yet good enough. Your present level of Spanish dictates how long you will need to improve and reach a level that will ensure you can pass the exam.
As well as permitting access to University of Granada courses, with this accreditation you can study at any of the Universities and Centres which are part of:
ACLES (Asociación de Centros de Lenguas en la Enseñanza Superior) (Spanish Association of Language Centres in Higher Education)
CERCLES (European Confederation of Language Centres in Higher Education).
CRUE (Conferencia de Rectores de las Universidades Españolas) (Confederation of Spanish University Deans)