University of Mumbai [MU]

Based on your educational qualifications of B.Sc in IT and NIIT certification, it is construed that you are preparing for a career in IT industry as a Developer. You may follow your passion in the field of computer science and opt for M.Sc in IT. You are further advised to do MBA after gaining a few years of experience to have a good growth in your career.

Many companies wouldn't accept a correspondence degree.

For a bright future, you should definitely follow a career wherein your interests lie. A Diploma in radiology is a good option. For now, you should study hard and devote a lot of time to practice as you will need this experience when you enter the industry as a fresher. Although you won't get hands on experience till you do your Masters, you should focus on practicals as much as you can. as practical knowledge has a lot of value in the industry.

There is no university which provides lateral entry for a correspondence course. You can check the same from the college you wish to take admission in if they can allow you.