Hello Deepasha!

Hope you are having a nice day!

I would like to inform you that yes should start your preparation from your 11th standard now because then it will be easy to crack those examinations in first attempt . And start reading and understanding NCERT Subjects from 6–12 class thoroughly, and do it twice or thrice.  And then Join a coaching institute during the final of your college, this well help in making a strong base, and clearing every doubt before appearing for the exam for the first time. And start making your own notes as well as revision will be done at the regular basis. So do make your study plan and work on that. And after the right efforts and dedication will leads you to the destination. So keep learning keep growing.

All the best for your bright future!

Thanks.