Whether you need to take an entrance exam for a BSc (Bachelor of Science) program depends on the university or institution you're applying to. Many universities, particularly in India, require entrance exams for specific BSc courses, especially in fields like Physics, Chemistry, Mathematics, Biotechnology, and Computer Science. These exams are often designed to assess your knowledge in subjects relevant to the course you're interested in, such as Biology or Mathematics. Some prominent universities, like Delhi University (DU), Jawaharlal Nehru University (JNU), and Banaras Hindu University (BHU), conduct their own entrance exams for BSc admissions.
On the other hand, some institutions offer direct admission to BSc programs based on your performance in Class 12th board exams. Universities like Symbiosis, Christ University, and various state universities often have merit-based admission, where your marks in subjects related to the course are considered for eligibility. Therefore, it’s important to check the specific admission requirements of the university or college you're interested in applying to, as the need for entrance exams can vary greatly.