In order to provide the workforce needed by the IT industries and various organisations with a skilled human resource for the development and management of computer resources as well as security, various colleges and universities across India offer the professional programme known as Master in Computer Application (MCA). As a result, for MCA admission, only qualified applicants are chosen through the entrance exam. Currently, numerous exams are held for MCA entry in India by various affiliated bodies. For entry to MCA programmes in colleges and universities in West Bengal, the famed WBJEEB administers the Joint Entrance Exam for Computer Application (JECA). The following exam's syllabus was mostly centred on aptitude and mathematics until 2021. However, the JECA exam's syllabus has been modified by the WBJEEB with effect from the year 2022. Therefore, this book has been designed lucidly to help the aspirants prepare for JECA. The contents of the book have been divided into ten chapters as per the latest syllabi of the entrance examination. Each chapter in the book contains the basic understanding of the chapter followed by an ample number of solved and unsolved practice exercises to help aspirants revise the concepts discussed in each chapter. As the book contains sufficient content as well as practice exercises, it is sure that it will help aspirants score high in the upcoming examination conducted by WBJEEB.