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The pre-requisites are:
Standardised test scores from either the SAT or the ACT. The prep books available for these tests at the US-India Education Foundation (USIEF) seems good.
Most colleges in the US expect scores from at least two SAT subject tests. These are exams that test in-depth knowledge of specific subjects. You can pick from a list of subjects like physics, chemistry, math, English literature, world history and foreign languages.
In addition to this, some colleges require TOEFL to ensure that you possess sufficient English skill. However, a good SAT score will waive this requirement, so check the college's website. You are recommended to take Andhra Pradesh or Advanced Placement Exams. You can also send additional material such as an arts supplement, research done, a resume or an extra recommendation letter.

There are numerous of career or job opportunities in government and the private sector. Aspirants can go for entrepreneurship or self-employed in their own fisheries-related business. You can see that in every state or country, the government has fisheries department in which you can apply for various posts. Aspirants can also do jobs in central government agencies like Marine Product Export Development Authority (MPEDA), Fisheries Survey of India (FSI), NIO, WHO, and many others. Degree holders can apply for research projects or can do further study. Candidates can find the number of job opportunities in institutions, banks, fishing/oceans and in foreign countries.
Top colleges from where you can pursue a B.Sc in Marine biology are as follows:
1) Cochin University of Science and TechnologySchool of Marine Sciences
2) CUSAT
3) Kochi (Ernakulam) 682016
4) Pondicherry University
5) University of Kerala
6) Annamalai University
7) Karnataka University
8) Veer Narmad South Gujarat University
9) Udhna Magdalla Road
10) Vikrama Simhapuri University
11) College of Science & Technology
12) Berhampur University