Hey,Samarth

for interior designing it doesn't need any particular stream , you go through any steam

what you are interested,well

i would reccommend you to go with maths because it will be used in designing so it will helpful  there,for you.

for detail information about carrer interior designing and to know courses available in interior desiging ,you can visit the below link

https://www.careers360.com/interior-design-course

hope this will help you

feel free to ask more queries on carrer 360