Military Nursing Service exam eligibility criteria is that you should have completed your 12th on Physics, Chemistry and Biology. So the exam is based on the topics that you have studied in these 3 subjects at 11th and 12th. So NCERT books will be enough for your preparation. Taxonomy, Cell and Molecular Biology, Reproduction, Genetics and Evolution, Human Health and Diseases, Biochemistry, Plant Physiology, Human Physiology, Biotechnology and its applications, Biodiversity, Ecology and Environment are the topics you need to cover in Biology. Laws of Motion and Work, Energy and Power, Properties of Matter, Electrostatics, Current Electricity, Magnetic effects of Electric Current, Electro Magnetic Induction and Alternating Current, Optics, Dual Nature of Radiation and Atomic Physics, Nuclear Physics, Semiconductor devices and their applications are the topics of Physics. Under Chemistry, Atomic structure, Block Elements, Coordination Chemistry and Solid State Chemistry, Thermodynamics, Chemical equilibrium and Chemical Kinetics, Electrochemistry, Isomerism in Organic Compounds, Alcohols and Ethers, Carbonyl Compounds, Carboxylic Acids and their derivatives, Organic Nitrogen Compounds and Biomolecules are the topics in Chemistry.