Distance

It is a good decision. But regular degree will have more value than distance education. While coming to salary also, it differs. If you are interested to do job and also study regular course at same time, you can manage your time in both of them like 4 days job and 2 days college ( if you take these choice, it will be highly risk one). You can do 2 years job and later, you can take a break in your job and do M.Sc. Biotechnology. And after your M.Sc. You can have lot of job opportunities. It's up to you which choice to select. Your life is in your hands.
All the best.

You may opt for B.Com (Hons). It will help you in terms of the course module and grip on accountancy and business law.

For that, you need to check the admission guidelines of the particular university where you want to apply in the 2nd year.

Definitely, it holds more importance. You can pursue through SOL, but also it will depend on what you do after that.

Regular B.Com is always better than correspondence. There after you can pursue M.Com from DU regularly through entrance test. January to June, DU conducts entrance test every year. You need to score more than 60% in B.Com.

Correspondence B.Tech from AMIE will be a good option. Generally, people who have job prefer to go with Correspondence B.Tech.

Jawaharlal Nehru Technological University and Indira Gandhi National Open University are the best.

IGNOU is a central university, and all it's degree are UGC recognized. You are eligible to seek admission in higher studies based on IGNOU degrees, and can also seek job in both Government and Private sector based on them.

If you have completed your Diploma, then you are eligible for admission in the second year in any branch. Many of the regular colleges offer distance B.Tech with a minimal fee. You need to find a good college for your degree.

You can apply with these institutions for distance MBA programme:
Symbiosis
IMT-Ghaziabad
Sikkim Manipal
AIMA
ICFAI
Amity University
And you can choose dual specialisation as finance and marketing or HR as per your future aim.
All the best.