Diploma

Hi,
It is always preferred to go for a regular degree course dear. A Diploma course is usually a short term thing which will help you for a certain period of time in your career but it's benefit won't last for very long. You cannot grow more in your field with these courses. I am not denying that your experience, efforts and skills do matter in how much successful you will be in your life but you cannot purely leave it to that. Courses do help you to get proper education, push in your career and self development.
Diploma courses are designed for immediate benefits which give you a minor stunt in your career when you SEE no growth in your job or just to shift from one area of work to the other. Diplomas give you basic knowledge and ideas of your subject but a full time degree course is very deeply designed to give an overall development of your skills and mindset.
Degrees stay with you all along your career life and they are valued even more when they grow old being part of an organisation. Degrees will be acknowledged by all your future employers and you will hold more value and preference over others.
So definitely, I would suggest you to go for a regular course of interior designing. I have been to IILM University, and would like to mention it to you for consideration. So you can definitely consider IILM University Gurugram for graduate and post graduate courses in interior designing and the university campus is also centrally located in the heart of Gurugram which will help you gain a lot of real life exposure with a pool of real estate players, building concepts, new age designers and interior consultation companies.

Hi
To get admission into BA, you need to pass in 10+2 and in most of the colleges in India, there is no such provision for direct entry into second year of BA for diploma holders of Electronics. You need class 12 marksheet with passing grades to get admission in a BA program.
You can apply for B.A after completing your diploma as diploma is equivalent to 12th. You can also choose professional course rather than B.A or the best option is to do graduation in the stream which you have already study in your Diploma.
Hence, first selection should be of a good college which is of repute so that it can give the best academic excellence in the form of best faculty who are there to help you. Added to this, well equipped labs and library. Exposure of the students to the world market and a wide platform for the student to deal with the world level activities is a must.
Browse some good colleges like LPU which gives best academic support along with the best scholarships also the Covid scholarships to aid education at such grim times.
You can check Lady Sri Ram College which is also good for BA.

Diploma in Electrical & Electronic Engineering, luckily you are in that field which is ever emerging and developing. Career options for the Diploma students are few in number but after your graduation, there are ample opportunities to grab from the best. Regarding choosing the best university or college, well I will recommend Chandigarh University. I am a student at Chandigarh University from Electrical Engineering, I am placed in an electrical core company in Havells, and CapGemini both are pioneer in Electrical Equipments. Chandigarh University is the top best universities in education in India, NAAC A+ accredited university best in infrastructure and placements. I will recommend you to pursue further B.E in Electrical Engineering from Chandigarh University. Hopefully, we will meet soon.