Apc/dgp kit has been meticulously prepared keeping in view the exact requirements of the NDA, NA examination. Each subject has been comprehensively dealt with and properly analysed. Presentation is simple, clear and lucid. Explanations, illustrations, examples, detailed solutions abound the book. Various concepts and formulas are adequately elucidated. Plethora of exercises have been given to provide the necessary drill and instil confidence in the candidate. It is hoped that this APC/dgp kit will provide the launching pad for Prefect take-off and successful flight.