Language tests are created for different purposes in order to measure learners’ ability, knowledge and competence in utilizing the language. Formal testing in education includes especially proficiency tests, placement tests, diagnostic tests and achievement test, but another kind of test also exists; aptitude test, which does not gain its well-deserved place in Hungarian education. The dissertation consists of two main parts. The former part deals with the proper definition of and the historical background to aptitude testing and the main types as well as advantages, which have been proved during the last five decades. The latter section deals with a research study carried out in a primary school in Nyíregyháza in order to demonstrate that aptitude tests are able to predict the learners’ future achievement in language learning, how aptitude scores relate to different factors such learners’ gender, grades in English, learners’ assessments in the four skills of learners’ achievement, learners’ family background. In addition, the paper emphasizes that aptitude tests should be applied and integrated in Hungarian education.