Academic achievement or (academic) performance is the outcome of education

Education

Education in its broadest, general sense is the means through which the aims and habits of a group of people lives on from one generation to the next. Generally, it occurs through any experience that has a formative effect on the way one thinks, feels, or acts...

 — the extent to which a student, teacher or institution has achieved their educational goals.

Academic achievement is commonly measured by examinations or continuous assessment

Continuous assessment

Continuous Assessment is the educational policy in which students are examined continuously over most of the duration of their education, the results of which are taken into account after leaving school...

 but there is no general agreement on how it is best tested or which aspects are most important — procedural knowledge

Procedural knowledge

Procedural knowledge, also known as imperative knowledge, is the knowledge exercised in the performance of some task. See below for the specific meaning of this term in cognitive psychology and intellectual property law....

 such as skill

Skill

A skill is the learned capacity to carry out pre-determined results often with the minimum outlay of time, energy, or both. Skills can often be divided into domain-general and domain-specific skills...

s or declarative knowledge such as fact

Fact

A fact is something that has really occurred or is actually the case. The usual test for a statement of fact is verifiability, that is whether it can be shown to correspond to experience. Standard reference works are often used to check facts...

s.

In California, the achievement of schools is measured by the Academic Performance Index.