Science

Most specializations in Chemistry or Maths are done through B.Sc. courses which are 3 year courses. If you are interested in 4 year courses you should opt for B.Tech courses in chemical engineering or applied Mathematics. Colleges for B.Tech in Chemical engineering and applied mathematics are mentioned below:
Chemical Engineering Colleges: https://www.shiksha.com/b-tech/colleges/b-tech-in-chemical-engineering-colleges-India
B.tech colleges in mathematics:
IIT DelhiDelhi
Delhi Technological University or DTU Delhi
Indraprastha Institute of Information Technology Delhi
Indira Gandhi National Open University or IGNOU Delhi(only after completing Diploma)
College of Engineering Trivandrum
Indian Institute of Space science and TechnologyThiruvananthapuram
Maulana Azad National Institute of Technology Bhopal
VIT Vellore Tamil Nadu
BITS Pilani Rajasthan
IIT Guwahati

Eligibility Of the Master of Science [M.Sc] (Agriculture)
The candidate should have a Bachelors degree in Agriculture or Horticulture or Forestry from a recognized university in India.
The candidate must also have passed the degree with minimum 50% marks.
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
You should be able to determine whether you are eligible for a course in M.Sc.(Agriculture). Please refer to the link provided below for details regarding top colleges which offer courses in M.Sc. in India.
https://www.shiksha.com/science/colleges/m-sc-agriculture-colleges-india

Master of Science is a Masters degree awarded by universities or colleges for studies in a specific branch of science, technology, mathematics, etc.
Usually it is an academic degree which is higher than a Bachelors degree and lower than a doctoral (PhD) degree.
After completing Bachelor degree, you can pursue a master degree in science. It is the best choice for science graduate students. The scope of M.Sc is very much demanding & you can gain a respectable job in this area after completing the program with good grades. There are various specializations that one can pursue in M.Sc program. In each and every specialization, opportunities are available in Medicine, chemical, petrochemical & Polymer industries. After passing master degree in science, you can go for a research study in top organizations such as BAARC, ISRO, etc. You can also work in a government & private sectors in various technical & non technical posts.