Career

If you have done biotechnology plus LLB then you can join research firms, agriculture or fertilisers industry in which you can work as a legal consultant. This is a rare combination of specialisation you have.

B.Tech in CSE is a very good branch and has a very good scope. The placement in this branch is also huge and almost every industry needs computer engineers. Since many countries like the USA has put restrictions on working visas and many engineers settled in other countries are coming back but there is a huge IT hub is being created in Hyderabad, Bangalore, Pune, etc. So there are good opportunities available in this course.

Dear,
If you like this subjects than you may choose any of the options for your further education:
1. CAT/MAT/XAT/GMAT/NMAT /SNAP competition exam for MBA in finance, international business, insurance or marketing.
2. Actuarial science
3. Competitive exams for Bank jobs
4. Development Studies
So choose the field according to your interest and calibre.
All the best.

You are advised to register for regular Ph.D / FPM or Ph.D by distance learning for a career as teaching faculty in B-Schools.

I think both have different importance, but MBA is a professional degree and it holds significant importance.

Yes, you can pursue BCA & MCA but once you get into this field you'll be an IT student only. This would be a good combination for your future.
And everything lies in the interest. if you have a keen interest in BCA & MCA then you can surely do better.