Hello,
As you mentioned you like Mathematics subjects, there are many career options you can follow such as

• Doing B.Tech in discipline such as Computer Science in which  applied mathematical concepts are used.
• Doing B. Sc Hons in Mathematics and appearing for government job exams such as UPSC Civil Services Exam, SS CGL.
• Bank exams such as SBI PO, IBPS PO, RBI GRADE B after graduating in B.Sc hons Mathematics
• Defence Forces exams such as NDA(after class XII), CDSE, AFCAT(After graduation)

So, as you can see there are a lot of career options available, choose the one which best suits your interests and callibre.

Good luck