History

Hi,
No it is not mandatory. A graduation degree in a relevant discipline is the minimum requirement. IAS is open to doctors, engineers, lawyers, etc.
You'll be given a choice to select optional subjects while applying for Civil Services.
You have not shared your academic details. However, there are several factors that need to be considered before choosing a particular stream after Class 12.
This is because the chosen stream would determine which path your career would take and the two main factors that should be taken into note while choosing a stream are:
Aptitude of the student
Personal Interests
Options for you-
Science Stream-
B.E/B.TECH
BCA or B.SC CS/IT
B.SC (either of PCM subjects)
Medical
Commerce Stream-
B.COM, B.B.A or B.B.M
Bachelors in Accounting & Finance
B.A Economics Honors
Bachelors in Bnaking & Insurance
Arts Stream-
B.A English
Bachelors in Journalism and Mass Communication
Bachelor of Arts with Humanities subjects
Besides, you may also consider-
1. Foreign language if aim for an interpreter's job in the consulates and embassies. Some of the choices in this regard are French, Spanish, German, Russian, Japanese or Chinese.
2. Courses in hotel management, performing arts, travel and tourism and more.
You can analyze the various opportunities available and select the right path based on your personal criteria which should include:
*The interest and aptitude towards the subject
*Interest to get a job
*The future Demand for the particular program
You may also refer the link below:-
https://www.shiksha.com/career-options-after-12th
https://www.shiksha.com/how-to-choose-your-career-before-you-start-college-article-4128-1
Also you may post your query on-
https://ask.shiksha.com/what-after-10-2-qna-2386784
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Minati, i recommend that you discuss with me or any other counsellor. Your predicament is a good predicament to have, it is a dilemma of plenty :-) Here is an article by Arena Chandigarh Centre Head on Shiksha website about how to select the right college https://www.shiksha.com/questions-to-ask-before-you-pick-an-animation-college-article-4699-1. And here is a complete snapshot of Gaming Industry by me on Shiksha website https://www.shiksha.com/from-gaming-to-game-designing-article-5827-1. Wish you the best for your career. Remember, your Career is a resultant of your knowledge combined with your passion and expression ability. If you like this answer you may select it as best answer or press like.