Distance/Correspondence

Yes, MCA is available in distance education in various institutes, not all institutes provide distance education but most of them do.

Yes, you can do this Diploma after your 12th from Kazian School of Management, Miraroad (East) Thane and there are other two, which provide online and part time classroom education for this Diploma. The information for these two is given in the below link.
Link- https://www.shiksha.com/accounting-com

Hi, you have made a good decision as Subharti University is a good option to pursue MBA through Distance Education.
All the best.

No, it is not possible to pursue B.Sc in cardiac science from Rajiv Gandhi Paramedical Institute Delhi through correspondence.

It's not a bad option at all. You can do M.Sc in chemistry from correspondence at ANU. This university is UGC approved, having NAAC accreditation (Grade 'A'). So, it's good to do M.Sc. chemistry in correspondence from this university.

No, Rajiv Gandhi University doesn't offer B.Sc in cardiac science in correspondence.

Yes, you can take admission in M.Sc chemistry in Learn Edutech. It is a 2 years course available here for distance and correspondence learning only. You are eligible for taking admission in it. For further information on Learn Edutech, follow the link provided below:
https://www.shiksha.com/science/