Interior Design

You need to check with the college. You might change the course.

Yes, you can apply for this course. After class 10th, you can do any Diploma course.

Hi Sanskar,
A student must be 10th pass from either The Central Board of Secondary Education Examinations (CBSE), The Council for the Indian School Certificate Examinations (ISCE) or Other certificates equivalent to GCE O level. Also, applicants should be 16 years of age or above in the year they are admitted to Year 1 of the diploma course. Details are easily on the website. Check here:
http://www.nafa.edu.sg/courses/diploma/diploma-in-design-(interior-exhibition)#collapseEntryThree

You can refer to the below link mentioned below:
https://www.shiksha.com/design/interior-design/colleges/colleges-india?uaf[]=location&ts=6904753&rf=filters&ct[]=10224

Yes, after completing Diploma in interior designing with a minimum of 50% marks, you have to qualify the National Aptitude Test of Architecture to appear for AIIA exam.

Every entrance exam has different pattern. You can refer to numerous guide books such as Bright Careers Guide NIFT Entrance Exams, Concepts of Pattern Grading and IIFT Entrance Exam Guide by Surendra, etc., which will provide you a lot of information about the exam, its pattern, syllabus, etc.