what are options in jobs after completing my 12th in maths

You can apply for various govt examination if you are planning to write government exam. You can write various exams conducted by ssc, upsc, other government organization. In ssc you can write ssc mts, chsl, steno, and for UPSC you can write NDA if you want to join Army, and other exams for storekeeper, clerk, etc etc. If you are planning about private job then there is not good scope and you will get less opportunity.