I am b.sc honours student can I apply for DRDO CDS SSC or other graduation base exam
Yes you can apply for these exams after your B.sc.
To apply for DRDO you will have to apply through CEPTAM entrance as this is the only entrance conducted by DRDO for all the B.Sc graduates.
You can apply for SSC CGL except Junior Statistical Officer (JSO) and Assistant Audit Officer (AAO). These posts requires a knowledge for the statistics and accounts.
All the best!!