dear friend.....
After complelting graduation (b.sc, b.com,b.tech) any one can apply c.d.s exam
a.f.c.a.t exams to join in defence services which will conducted by u.p.s.c in 2 times in every year
these exams you bring to Navy,air forces,army services
Selection process
1.written test
In this general maths ,g.k,aptitude is present
2.interview
In this they ask you recording your personal details
3.physical test and medical test
Qualification
You have to scored 60% in your graduation
Your age must be between 19 to 24 years
You are the citizen of Indian
You must be unmarried status.