Paperback - 2018 Edition - Helios 90 - GS Manual by Helios Coaching

The GS Manual is designed to serve as a complete self-study guide for thousands of aspirants. The manual is systematically structured by treating each subject as a whole, and then organizing relevant information in such a way so as to cater to the specific needs of the readers. Each subject has been developed by a specialist trained in teaching that subject to the beginners. Although a guide cannot replace the basic books that you have to refer, it surely is handy when it comes to finding information on all subjects and topics at one place.