Can I get into defence field on the post of an officer after graduating from commerce stream?

Hi, Yes, commerce student can join Army. For joining Indian army, you have many ways. After class 12th, you can apply for NDA entries. After graduation, you can apply for CDSE, NCC, UES, TGC, ACC, SCO, PCSl. In all above case, you have to clear SSB interview to get selected. Also, eligibility for a

You are eligible to appear for CDS examination conducted by UPSC to join Indian Army non-technical corps. You are also eligible to join admin and accounts branches in Indian Air Force.