You should always prefer a course according to your interest and passion. 

If you have mathematics as a subject then you have good scope related to job in both private and public sector.

You can apply for a job like ISRO, DRDO and NAL.

There are many good private companies which provides good offers.

After 12, you can go for B.Sc, B.Tech/BE which have very good scope in the future.

Good luck!!