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Hi,
This depends on individual's interest and other factors like, your field of graduation and your career prospects.
Major disciplines in MBA, you can look for are as follows:
1. Operations: It needs analytical knowledge with fair hands-on mathematics.
2. Finance: It needs basic knowledge of accounting and share, equity, credit-debit transactions.
3. Marketing: It deals with the promotion and advertising strategy to convince the target customers for your product.
4. HR: It requires good communication skills to deal with your team. You need to get the best out of your team and keep them motivated.
5. Mass communication: If you are interested in media and mass communication and have good speaking skills.
As you have completed graduation in agriculture, you will find operations / supply chain in line with your graduation course. Though, most of it would need basic mathematics.
https://www.shiksha.com/mba/articles/top-10-mba-specializations-blogId-5284

Hi,
The entrance to some of the most revered B-Schools in India, which include XLRI and XIMB, the Xavier’s Aptitude Test or XAT, is a far cry from CAT, and in fact, from any entrance examination for that matter.
XAT is famous for its high difficulty level. XAT syllabus consists of English, Quantitative Aptitude, Logical Reasoning, Data Interpretation, Decision Making, General Awareness and Essay Writing. Here are some syllabus details, based from last year’s XAT paper pattern.
Quantitative Aptitude (QA) & Data Interpretation (DI)
In XAT, there are three sets of DI questions. Quant has similar sections like CAT exam. Here are some of the quant topics that are covered in the exam:
Percentage
Profit and Loss
Ratio
Variation
Time and Work
Time, Speed and Distance
Tables and Caselets
Probability
Critical Path
Averages and Partnerships
Alligations and Mixtures
Algebra
Linear and Quadratics Equations
Surds and Indices
Inequalities
Logarithms
Numbers
Mensuration and Geometry, etc.
English Language and Logical Reasoning
Topics in this section include:
Fill in the blanks (vocab and grammar based)
Grammar questions
Para Completion and inference
Reading Comprehension
Verbal Logic
Parajumbles
Topics under this section include:
Decision making
Sets
Logical reasoning
General Knowledge
The GK syllabus consists mostly of the following topis:
Awards and winners
Business
Economy
Government and Politics
Science
Famous Personalities
History
Geography
Current affairs
Important happenings around the World
Static GK
XAT GK section is dominated by current affairs and news, with around seven questions related to international on-going issues like Syrian crisis, Crimean referendum, Boko Haram.
Essay:
Essay section has no fixed subject. Essay topic could vary from general affairs to abstract subject. The idea to present your chain of thoughts on the subject in an order.
The exam has roughly 90-100 questions on English, QA, LR & DI and Decision Making. The test also includes questions on General Awareness.
https://www.shiksha.com/mba/exams/xat/syllabus

ELIGIBILITY CRITERIA:
(I)For admission to any of the First Degree programmes of BITS except B.Pharm: Candidates should have passed the 12th examination of 10+2 system from a recognized Central or State board or its equivalent with physics, chemistry and mathematics (PCM) and adequate proficiency in English.
(ii)For admission to B.Pharm: Candidates should have passed the 12th examination of 10+2 system from a recognized Central or State board or its equivalent with physics, chemistry and biology (PCB) and adequate proficiency in English. However, candidates with PCM may also apply for Pharmacy program.
Admission to all the programmes is subject to the conditions given below:
The candidate should have obtained a minimum of aggregate 75% marks in physics, chemistry and mathematics subjects (if he/she has taken mathematics in BITSAT) or a minimum of aggregate 75% marks in physics, chemistry and biology subjects (if he/she has taken biology in BITSAT) subjects in 12th examination, with at least 60% marks in each of the physics, chemistry, and mathematics / biology subjects.