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Rank: 768 in TBJEE (SC category) — it's a good score, so you should have some good options in the public universities here.

B.Sc Agriculture
The main subjects include plant biology, agronomy, soil science, horticulture and agricultural economics.

Some familiarity with chemistry (such as soil types and fertilizers) is helpful, but not required.

Agronomy jobs are available in agriculture ministries (e.g. Agriculture Officer, Extension Officer), agribusiness firms, companies dealing with seeds and fertilizers, research institutes and agri-related banks (Agri Officer).

Making progress: Masters of Science in Agriculture or an MBA in Agri-business, for example.

Fisheries Science is commonly studied under the degree of B.F.Sc (Bachelor of Fisheries Science).
Main Subjects: Aquaculture, biology of fish, aquatic ecology, diseases in fish and oceanography.

Water chemistry, biochemistry and toxicology in aquatic animals are the main chemistry fields necessary.

Fisheries Dept (government jobs), aquaculture farms, seafood industries, research, NGOs and teaching are some areas for graduates.

Some students choose advanced degrees like M.F.Sc or MBA (Fisheries Management).

If you are unsure which should You Choose?
You prefer biology, but are less inclined towards chemistry, so considering the typical subjects involved:

A better option may be B.Sc Agriculture.

It helps people find many more career opportunities in government and banking.

There is chemistry involved, though it is not handled in the same detail that Fisheries involves.

People from rural or semi-urban areas usually find agriculture-related jobs more available and meaningful.

The rank is based on the number of points in TBJEE (768, SC Category).
You stand a good opportunity of getting:

CAU, Lembucherra (College of Agriculture, Tripura) is considered one of the best agricultural colleges in the state.

Perhaps Fisheries College is another one (in case it is offered under TBJEE)—just make sure to view the seat matrix.

Final Suggestion:
Consider going for B.Sc Agriculture; it fits your interest in biology, there is less chemistry required and it opens up more career paths, mainly in government sectors.