Disaster management

Your question gives me the impression that you have absolutely no basic knowledge of how disaster management works. The National Disaster Management Authority (NDMA) is the main government body responsible for planning and capacity building to be prepared for an emergency disaster situation. The National Disaster Relief Force (NDRF) is the most important organisation that that deploys personnel for search and rescue operation in the event of a disaster. The National Institute of Disaster Management (NIDM) provides the training for disaster management. All three are part of the Ministry of Home Affairs. The Ministry of Science and Technology has a department of scientists in the field of Geology and Earth Sciences who offer advice NDMA, NDRF and NIDM. The Indian Police Service and the Defence Forces have their own training programmes (for selected personnel) in disaster management and offer their services in the event of a disaster. Apart from what I mentioned above, Aniruddha Academy of Disaster Management (AADM) in Mumbai is a not-profit organisation that provides training and volunteers in the event of an emergency. AADM is suited for teenagers, as the first step, who wants to work in Disaster Management. Finally, the Indian Institute of Remote Sensing (IIRS - part of ISRO) based in Dehradun offers Postgraduate and PhD courses in Geoinformatics, Geosciences, Forestry and Ecology, Marine and Atmospheric sciences. Postgraduates and Doctorates from IIRS work are employed by NDMA.

Requirements for courses in disaster management varies according to the institution and the course they have introduced in the university. Before taking admission check with the institutions what grades and qualification you want pursue before you submit the application.
Students from any streams are eligible to join the course.
Candidate should have passed Higher Secondary Certificate Examination (10+2) with minimum of 55% marks .to pursue the certificate and Bachelor course
For PG Programmes:Candidate should hold graduation in any field from any recognised institute or a University.
For Ph.the: Candidate should have minimum of 55% marks in the Post Graduation.
All the Best.