Hello Gaurav, 

            CDS 2 2019 will be conducted in the month of September.

         You may start your preparations from now.  Regarding the coaching institutions  you may look for them on intetnet as there will be many, however you can prepare it on your own. Can buy a Pathfinder online n start solving it. Maths  in CDS is very basic and not that tough. You need to read newspapers and go through current affairs daily for your GAT as it is a bit difficult.

Good Luck