Agricultural Engineering

After Diploma in agricultural engineering, you cannot get B.Com most of the universities require Management or Commerce or Economics in Diploma.

If you have completed Diploma in agricultural engineering, then yes, you can apply for the degree.
All the best.

To pursue B.Tech in agriculture, you should clear the Agriculture Entrance Exam like ICAR AIEEA and other state Entrance Exams like JCECE BCECE KCET KEAM etc. And various private Institutions also have their Entrance exam for Agriculture such as LPU-NEST BVP CET SAAT etc. After clearing the desired Entrance exam you will be able to take admissions in some of the best Institutions of our country.

Passed or appeared in 10+2 Science/equivalent with P.C.M. 45% marks in aggregate (Minimum requirement of 40% marks is applicable to reserve category candidate)
Course fee: 5 lakhs.
The JEE cut-off varies each year. You should obtain at least 75 or above.
Good luck.

Generally, the cut off for B.Sc Agriculture is high. You can check the cut off for Agriculture of this year on their official website. Just wait for the counselling, maybe, you can get a seat in the second or third session of counselling.

Yes, you can take admission, but with this score, you may not get a good college. So, choose the best in what you can get. You can do agricultural engineering.
Good luck.