- Achievement tests measure students' learning attainments and proficiencies after a period of instruction. They assess how well learning objectives were met. - The purposes of achievement tests include promotion, assessing teacher effectiveness, informing parents, and helping classify students. They provide information on students' knowledge, understanding, application, and skills. - Important criteria for a good achievement test are validity, reliability, objectivity, and practicality. Tests should be easy to administer, score, and interpret in an economical way.