This book is for the beginners as well as expert learners. The book is primarily focused on the various tricks, logical concepts and short notes of C, Data Structure & Algorithms, Operating System, Data Base Management System, Computer Networking & Object Oriented Programming using JAVA . Out-of-the-box questions and solutions are discussed deeply that cannot be found in normal text books. It will help the readers to cracking the Technical Interviews. The book consists of more than 750 questions with the answers and many questions with proper explanations. Hope the book will benefit the peoples those are appear for Campusing in Technical Section like "Computer Science", "Information Technology", "Electronics Communication Engg.", "BCA", "MCA" . I am excited for you and for the skills you are going to develop thorough preparation will give you a wide range of technical skills. I will be well worth it, no matter where the effort takes you!. I encourage you to read these introductory chapters carefully. they contain important insight that just might make the difference between a "hire" and a "no hire". Study hard, practice and good luck!.