All the topics are important for the exam but here are some of the topics for Biological Science you can prefer given below:

Biochemistry, Animal biotechnology, Plant biotechnology, Immunology, Molecular biology, Genetics, Cell biology, Developmental biology, Human physiology, Microbiology, Industrial microbiology, Plant physiology, Environmental biotechnology, Ecology and Evolution, Enzymology, Biodiversity & Classification, Agricultural biotechnology, Herbal Drug Technology, Medical biotechnology.

Good Luck!