Science

You can surely pursue CS as it doesn't consist of hardcore mathematics. Yes, however, it is not exclusively maths but some or the other form of maths.
For instance, you can count accounting as a form of maths solely because it involves numbers, but the concepts and rules of accounting are by themselves independent and unique and are not mathematical.
On the other hand, advanced subjects like Costing and Financial Management are mathematical. However, be advised that these subjects make up hardly 20% of the total course and are not as focused on maths as the one's in CA or CMA.
CS moreover focuses on Company and corporate laws. It is moreover important to have a detailed knowledge of the theoretical part. Practical knowledge is important. However, a company secretary directly doesn't involve practically into accountancy work. He/she is an officer who has to keep a check and balance over the entire working of the company for efficient administration.
I hope this would suffice.

How to Get Admission in Master of Science [M.Sc] (Agriculture)
The admission to the program is based on performance in the Entrance Examination and the academic record of the student in graduation.
Some of the Entrance Exams for M.sc in Agriculture is as follows:
AGRICET: Acharya N.G. Ranga Agricultural University conducts a Common Entrance Test for admission to M.sc in Agriculture. The application forms are available online from May/ June and the exam is held in July.
ICAR AIEEA: ICAR conducts an All India Entrance Examination for Agriculture. The application forms are available online in February and the exam is held in April.
MCAER PG CET: The Maharashtra Council of Agriculture Education & Research holds a PG Common Entrance Test for various programmes, M.sc in Agriculture being one of them. The applications are available online in month of March and the examination is held in May.
Hence, to sum it up, if the candidate is eligible, they can follow the process as given below:
Fill in Application form
Clear the Entrance Exam
Admission to the program