Hello Vijender,

CDS is a competitive entrance exam for joining armed forces conducted by UPSC,its eligibility is graduation in any disciplinary University recognised by the government of India combined defence service consists of 3 subjects English, Mathematics, General knowledge,for a chance to go for SSB interview you need to qualify all the subjects with minimum scoring,total marks for CDS is 300,100 for each subject,You need to qualify all the subjects with minimum scoring to get a call letter for interview for SSB screening.

All the best.