How can I become an officer in the Indian Army?

For joining Indian Army, you have many ways. After class 12th, you can apply for NDA TES 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 all entries is different. Check it with

Humanities students are eligible for non-technical arms of Indian Army as a Commission officer by appearing for CDS and OTA examination after graduation degree or by appearing for NDA examination after class 12th stage.

In addition to this, keep in mind that SSC officers are hired on contract basis. At the end of tenure, you may or may not be given PC. Also, SSC officers have limited facility.