This single books is divide into two volumes. VOLUME - I contains theoretical explanation of some very important topics from which questions are repeatedly asked in the examination. Areas covered include 1. Atmospheric science 2. Env Chemistry 3. Env biology 4. Env Geography 5.Hydrosphere 6. Noise 7. EIA 8. Solid waste management 9. Statistical analysis 10. Global climate change VOLUME- II contains all the previous year questions segregated in topic wise manner and as per the latest syllabus.