Dear applicant it totally depends on your curriculum of choice. If the B.Sc hons subject is zoology or Botany or Chemistry, Physics, math then you have to emphasize on detail into the portions you studied in both the classes. But if your topic is molecular biology, marine biology, biochemistry, biotechnology etc. then you will have different syllabus based on your course. So it solely depends on the course you chose, don't be nervous,

All the best!!