B.Com

B.Com in Distance Education
Bachelor of Commerce, abbreviated as B.Com, is an under graduate degree in commerce and related subjects. The degree generates professional skills among students according to their selected course such as Accounting, Statistics, Economics, Finance, Taxation etc. The purpose of the correspondence B.Com degree, offered by NIBS, is to render student with outspread array of operational skills, to specialize the student in a specific area of business and to expose the student to basic business principles. In this way, our students can not only survive, but also grow and fulfill their dreams in this competitive age.
B.Com. degree in distance education, which meets world class quality parameters and that too with greater flexibility. One remarkable feature of distance learning programs is that students can find employment and self-employment opportunities while pursuing the course. We possess top class commerce professionals who design and develop our distance learning B.Com course structure, syllabus & study material. The course spans over a period of 3 years. We cover all the major subjects in our correspondence commerce graduation program.

I will give you my views based on the assumption that DU is the only option for you.
B.Com (h) opens up accounting avenues. You can pursue CA along with it but then you will have to do a correspondence course as the new rule of DU does not allow regular B.Com (h) students to pursue CA too.
You must have heard about the Big4: KPMG, Delloit, E&Y, PwC. If you dream of working in these audit companies then this is the apt choice.
My personal advice would be to opt for a regular course if you are getting good colleges like SRCC,LSR or so. Believe me the experience you get there is unmatched and you will cherish it forever.
Economics (hons) does not have accounts in its syllabus. You will get to read subjects like Macro eco, Micro eco, International eco, Stats, Maths, History of Indian eco, environmental eco etc. If you want to do research based work or policy making and/or wish to become a college professor then this is the right choice. Masters in economics is the most preferred choice after this course which is also mandatory for becoming a professor or getting into Indian Economic Services (IES).
There are three other courses that you have not mentioned but I think they might interest you. BBE, BBS, and BFIA. DU conducts an entrance exam for admission to these courses. The final merit list is drawn on the basis of Boards exam marks, entrance test score (BBE) + GD-PI score (BBS, BFIA).

How to Get Admission in Bachelor of Science [B.Sc] (Agriculture)
Admission in universities or institutes offering B.Sc Ag is done basically in two modes. Either on the basis of the marks obtained in the qualifying examination (Direct Admission) or written exam conducted by the university/institution that offers the degree.
The details on how to apply for B.Sc. degree in Agriculture can be collected from the authorized website of the institution. The information about course details and available number of seats can also be collected from here. The application forms can be obtained either through the college office or from the concerned web portal.
Entrance exams for B.Sc. Agriculture-
ICAR Entrance Exam (ICAR-AIEEA)- It is an agriculture entrance exam conducted by Indian Council of Agricultural Research (ICAR) for admission to 15% seats in Agriculture Universities in Bachelor Degree programs and 100% seats in ICAR Deemed to be Universities and NDRI, Karnal
EAMCET- Conducted for admissions in Agriculture colleges and universities in Andhra Pradesh
PAU Entrance Exam- Conducted by Punjab Agricultural University
KEAM- Conducted for agricultural colleges in Kerala
IGKV CET- Conducted by Indira Gandhi Krishi Vishwavidyalaya
Direct Admission in B.Sc. Agriculture-
Some colleges offer B.Sc. Agriculture admission simply on the basis of marks obtained in qualifying exam. Direct admissions in B.Sc. Agriculture are solely based on merit prepared by university/institute offering course.

There are many short courses that you can do along with B.Com. You can do certification courses in IT. You can also do part-time Diploma courses during the weekend. There are many short courses available like Diploma in financial management, Diploma in banking.
I would suggest the below options:
1. NCFM certifications for Stock Market
2. Tally software course
3. Good computer skills course, which includes typing and MS Office
4. A Foreign language can be opted.
5. Advanced Diploma in Financial Accounting & Taxation
6. Certificate in Accounting Technicians (CAT)
7. Diploma in Accounting & Auditing
8. Diploma in Banking & Insurance Management
9. Diploma In Stock Analysis and Trading (DSAT)
10. Diploma in GST Rules & Procedures