Civil Servant Groups A1, A2, C1 and C2 Explained

Spain classifies civil service posts into groups A1, A2, B, C1 and C2, and the group a post belongs to is determined primarily by the academic qualification required to apply for it, as set out in the TREBEP, the Estatuto Básico del Empleado Público. Group A1 and A2 posts require a university degree, group B requires a higher vocational qualification (Técnico Superior de Formación Profesional), group C1 requires Bachillerato or an equivalent vocational qualification, and group C2 requires only the ESO, Spain’s compulsory secondary education certificate. Knowing which group your qualification puts you in is the first filter for which oposiciones you can even apply to.

What each group actually requires

• Group A1: university Grado (or the older Licenciatura). Posts in this group typically involve higher management, planning or specialised technical responsibility.
• Group A2: also university Grado, but posts in this group generally carry a different scope of responsibility than A1, even though the academic requirement is identical. The distinction between A1 and A2 for the same qualification level comes from how the specific corps defines the post’s functions, not from a separate degree requirement.
• Group B: Técnico Superior de Formación Profesional (higher vocational training) or an equivalent qualification. This group is less common than the others and mostly used for specialised technical roles.
• Group C1: Bachillerato, Técnico de Formación Profesional (Grado Medio), or an equivalent. This is the group for Administrativo del Estado C1 and for Gestión Procesal y Administrativa.
• Group C2: Graduado en Educación Secundaria Obligatoria (ESO) or a higher qualification. This is the entry group for Auxiliar Administrativo del Estado.

Teaching posts like the Cuerpo de Maestros sit within the A2 group, requiring the specific university Grado in Educación Infantil or Educación Primaria, since the qualification demanded is tied to the profession itself, not only to a generic degree level.

Why the same degree level splits into A1 and A2

The genuine distinction between A1 and A2 is functional, not academic. Both require a Grado, but A1 posts are generally structured around higher-level direction, design of policy or specialised technical judgement, while A2 posts apply established procedures and technical knowledge within a defined framework. Each convocatoria’s bases specify which group a post belongs to; you cannot infer it from the degree title alone, since the same qualification opens both A1 and A2 posts depending on the corps.

Does the group determine the exam difficulty?

Not directly, though there is a general correlation: higher groups tend to require broader and more theoretically demanding temarios, and often add a practical case exercise that tests judgement rather than recall. But difficulty within a group varies a great deal by corps, applicant volume and number of vacancies, which is why looking at the actual pattern of stages for a specific exam matters more than assuming difficulty from the group letter alone.

How does the group affect pay and career progression?

The group conditions the base salary scale (retribuciones básicas) and the trienios (seniority increments), since these are tied to classification level rather than to the specific corps. It also affects promoción interna: moving vertically from a lower group to the one immediately above it is the mechanism civil servants use to advance without leaving the administration, typically after a set minimum number of years in the lower group.

Choosing which group to target

If you’re deciding between preparing for a C2 post like Auxiliar Administrativo or a C1 post like Administrativo del Estado, the qualification bar is the first constraint, but the ratio of candidates to vacancies and the exam format matter just as much. Which oposiciones are genuinely easier to pass looks at that trade-off directly, and understanding how the temario is structured for a given group’s exam will tell you what kind of study load to expect before you commit months to one path over another.

Frequently asked questions

Can I apply to a C1 oposición if I only have the ESO qualification? No. C1 posts require Bachillerato or an equivalent vocational qualification; ESO alone qualifies you only for C2 posts.

Is a Diplomatura the same as a Grado for group A2 purposes? Generally yes; the former Diplomatura universitaria is treated as equivalent to the current Grado for classification purposes in most convocatorias, though always check the specific bases.

Which group has the most oposiciones on offer overall? It varies by year and administration, but C1 and C2 administrative posts tend to have large, frequent calls at the state level, since general administrative support functions need higher headcounts.

Does having a higher degree than required help me in a group C2 process? Not for eligibility, since C2 only requires ESO, but additional qualifications can add points in the merits phase if the process is a concurso-oposición.

Can I move from group C2 to C1 without a new full oposición? Yes, through vertical promoción interna, a restricted process open only to existing funcionarios that typically has fewer exercises than the equivalent turno libre exam.