Diploma

You can opt for any of them.
If you pursue 12th first then it will provide you all the basic physics along with some extra-curricular activities.
But if you go for Diploma then you will deal with the technical terminology.

After completing Diploma a candidate is eligible for 2nd year B.Tech. Lateral entry admission procedure is offered by every college for Diploma students.

No,
Eligibility for the course is 10+2.

Both B.Sc agriculture and B.Tech agriculture engineering are prospective as subjects. By doing B.Tech agriculture engineering, you can sit for GATE and pursue your M.Tech from IITs and get placed in private sector jobs with handsome pay scale.
You may also opt for jobs after your B.Tech. Many tracto

Yes, you can enroll in B.Tech programs pan India under Lateral Entry programme. But doing B.Tech from West Bengal would be a good choice instead of Jharkhand.

If you have scored good marks in JEE Mains then you can get direct admission on the basis of that rank. If you want to take direct admission then all the private colleges do that. You can fill various university forms such as UPTU, PTU, Jamia, AMU, etc.

You need to complete 12th or Diploma for graduating. After that you can pursue B.Tech or any graduation course such as B.Sc.

You can opt some other courses related to your field, like if you are in civil then you cannot enroll for CSE.

Some of the top colleges and institutes which provide admission to PG Diploma in Yoga are as follows:
Andhra University - AU, Visakhapatnam
Panjab University - PU, Chandigarh
Singhania University, Pacheri Bari
Hemwati Nandan Bahuguna Garhwal University, Garhwal
Lovely Professional University
GD Goenka Un