After 10th

The best option is to complete 12th as you will allow you to pursue good courses later.

Hi Harsh,
Please refer to the link below for detailed information on the course:
https://www.shiksha.com/design/interior-design-chp.

Mentioned below is the criteria for taking admission in the respective college-
Candidates must have passed PUC or 10+2 examination in any stream or equivalent from Academic/ Vocational / Open schooling stream of any recognized colleges or Universities.
OR
Must have passed 10th standard plus two-year ITI, ITC, NSQF level 4 in any branch.
OR
Must have passed 3 years Diploma in Engineering/ Technology/ Management/ Commerce/ Arts/ Nursing.
OR
Should have passed any other qualification considered equivalent to 10 +2 by Govt. of India.

Please click on the link below:
https://www.shiksha.com/humanities-social-sciences/articles/choose-your-stream-wisely-after-10th-class-blogId-6111

Kindly go through the short term crash courses available online, as they will provide the hands on experience to you and you will be learning in a shorter span of time.

You need to pass 12th std with a minimum of 50% for being eligible.

Without completing class 12th, it is going to be very hard for you to get accepted. 12 years education is the minimum requirement. You can look for a poly or Diploma course, but if you want to go abroad and have a good education complete your class 12th with good marks and roads will be open to you in future.

Please click the link below:
https://www.shiksha.com/it-software/colleges/distance-correspondence-bca-colleges-india.

No, this course is available after class 12th.