Bachelors

I presume you have done B.Sc in agriculture. You can do a course in agribusiness management from IRMA Anand or pursue M.Sc, if interested in higher studies. Then, Ph.D research to be a researcher which has great scope (respect) in India as also abroad. But, perseverance is important. Or, start your own agri-business straight away (if own land) / agri-input dealer shop, etc. Or, you can open Agri Clinics & Agri Business Shop. Whatever you do, keep in mind that Indian farmers need your agri services the most in whatever form. Even if you are able to guide 100 farmers a year in terms of standard package of practices (PoP) of agriculture, it's your best contribution each year. Agriculture is next to godliness.

Yes, commerce students can also pursue BCA without any problem. Just make sure that you score atleast 45% in your class 12th from a recognised board of education then you can easily get admission into BCA. You just have to be interested towards learning and understanding the concepts of programming languages so that you can secure good marks in your BCA. If you want to learn programming languages which you will be studying in your BCA course then you can check out this app which is specially designed and developed for BCA students. It has programs and assignments of languages like C, C+ and Java with their outputs. You'll be studying these languages in your 3 years of BCA. https://play.google.com/store/apps/details?id=technark.bca_courprogramming.

Hello,
If you want to pursue M.Sc from IITs/IISc through IIT JAM then you must have 55% aggregate marks at B.Sc. Level. If you satisfied the complete criteria then you can apply for JAM. If you have done your B.Sc in chemistry then I will suggest you prepare for IIT JAM Chemistry: https://goo.gl/F8vLLR
The basic criteria for JAM given below: -
IIT JAM 2019 is open to all nationals (Indian/Foreign). There is no age restriction, i.e. there is no IIT JAM age eligibility, regardless of your current age, you can apply for JAM. To apply for admission to the desired programme, a candidate is required to qualify in the corresponding Test Paper and also satisfy the Minimum Educational Qualifications (MEQs) and Eligibility Requirements (ERs) of the respective academic programme. The candidates who have either appeared or are due to appear in the final examination of their qualifying degree in 2019 are also eligible to appear in the test.