Which type of benefits I would get if I choose maths after 12th
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!!