BCS is an examination conducted by the Bangladesh Government to assess the candidates’ knowledge and understanding of basic concepts in Bangladeshi language, literature, and science, as well as in Mathematics, the world's most used academic subject. 

The BCS exam consists of both a written test and an objective test. In the written test, there is no restriction on the number of essays that you can write. In the objective test, there is a limit on the number of essays, and each essay is marked with one to five points.

On top of this, if you pass both the written and the objective tests, you will be able to obtain a Certificate of Basic Sciences, which you can use to take your next exam. 

The app covers all the subjects of BCS and has questions from the past exams.

If you have taken an exam, you can create a list of your mistakes and your progress.

To add an exam, choose "Add exam." Choose a title and mark the correct and wrong answers. After that, you will be able to see how much you have learned and how well you have prepared yourself.