Hello Golam
You have lots of option except teaching-
You can join government agencies through SSC CGL. You can get income Tax Inspector, Exercise Inspector, Assistant Section Officer in CSS or Central Ministries.

You can also go for Masters through cracking IIT JAM.
You can go for UPSC as well if you have enough potential to crack it.
You can also go for MBA after that you can join as assistant managerial post in Private Companies.
Good Luck.