Hii!
You can either choose to work or study further. Of you passed class 12th with maths, you can have ample of options to look into such as doing bachelor's degree in the subjects you desire like maths, physics, chemistry, or can pursue courses like, ethical hacking, IT, forensics, communication, multi-media and community, business, b.com, Art's, defence, fashion designing, etc.,
You can look forward to jobs such as teaching, research, industrial jobs, entrepreneurship, business, or in one of the above mentioned course fields.
You can also prepare and opt for government jobs via UPSC, SSC CGL, RRB, RBI, or state level exams etc.,
Hope this helps.
Good luck!