Hey,
Your future largely depends upon the hardwork you put in today.
See,you can prepare for any competitive examination like Union Public Service Commission(UPSC),Banking,Railways etcetera while studying your graduation. And your 12th percentage will only help you get a good College rest everything depends upon your creativity and individual talent.
So,first off be sure of your calling. Choose what you want to become and work accordingly.
Hope this helps.
Good luck.