Hello,
To prepare for the AIIMS MSc Biotechnology entrance exam, focus mainly on your BSc subjects such as Botany, Zoology, Biochemistry, Microbiology, Chemistry, and Biotechnology. You should study standard reference books like Lehninger for Biochemistry, Kuby for Immunology, and Prescott for Microbiology. You can also download and practice previous AIIMS MSc Biotechnology papers to understand the pattern and difficulty level. Solving sample questions and giving mock tests regularly will help improve your speed and accuracy. A proper study plan, along with revision of important concepts and continuous practice, will increase your chances of scoring well in the exam
Hope this helps you.