Science

It is better to do 5D animation course. Also, do Java programming course.

You may refer to following link for DTU B.Tech syllabus:
http://dtu.ac.in/Web/Academics/syllabus.php

If you get admission based on your 12th you may take admission in BA. Also, you may appear for maths reexamination as it will be helpful to you in future.

Firstly, please confirm whether you have completed your UG or not? Then I will have a better clarity to explain you the best option. If you have completed UG, my suggestion would be to go for MBA. After M.Tech in biotechnology again you will be in a dilemma to choose the next course after M.Tech to get a good job.
All the best.

If college will fund your stipend for your Ph.D, it would be a better option. If not, it will take a long time to get out of this course and to find jobs either in the education field or in any other field. No company will recruit Ph.D graduates directly at the initial level because of the fact that they need to pay a higher amount for the same job that would be done by a UG student. Please select carefully. Only if they provide stipend during your Ph.D then opt for the same.
All the very best.

If college will fund your stipend for your Ph.D, it would be a better option. If not, it will take a long time to get out of this course and to find jobs either in the education field or in any other field. No company will recruit Ph.D graduates directly at the initial level because of the fact that they need to pay a higher amount for the same job that would be done by a UG student. Please select carefully. Only if they provide stipend during your Ph.D then opt for the same.
All the very best.

Please try to appear for ICAR and your state entrance exams to join in B.Sc agriculture. Minimum score required in 12th is 55%.