GREMBA is a quiz-based mobile application that helps 6th and 8th grade students prepare for the Hungarian language entrance exam in high school. The central Hungarian entrance exam is basically competency-based, but in order to achieve a good result, you also need a background knowledge of grammar and literature, which can be easily practiced with the application and gives you the opportunity to gain extra points. There are currently more than 2,200 questions in the application, dividing the knowledge into 8 larger units: Sounds, Words, Sentence Parts, Spelling, Grammar and language games, Sayings and proverbs, Literary knowledge and Extra content. The questions are adapted to the curriculum of the Hungarian language and literature subject in elementary school, as well as to the admission tasks of previous years. When creating the application, we paid particular attention to making it interesting and enjoyable for students to use, as well as to allow them to practice through examples used in everyday language and song lyrics. In the Extra contents, we provide tips and advice for the reading comprehension and writing tasks of the admission, as well as for the admission process in general.Preparation for the central Hungarian admission is a period full of excitement for all students, requiring a long preparation process. However, the mobile phone is in the pocket of every applicant, so even in their free minutes, sitting on a train or bus, they can prepare for the entrance exam and learn grammatical and literary knowledge that they can successfully recall while writing the entrance exam list. The application is available on mobile devices with the Android operating system (phone, tablet) for a one-time download fee - i.e. it is not a subscription, but the application can be used for an unlimited time after downloading. Internet connection is required to download and use the application.