As you want to write AIIMS Entrance Exam for admission in MBBS program , for the same you are asking for its syllabus , so on your demand I am providing same for you

Physics Syllabus

Measurement
Motion
Circular Motion
Wave Motion: Optics
Kinetic Theory of Gases
Physics of the Atom: Thermodynamics: Work and heat, first law of Thermodynamics.
Electricity
Electro-Magnetic Induction
Solids
Nuclear Physics
Electronic Devices

Chemistry Syllabus

Section A: General & Inorganic Chemistry

Structure of Atom
Molecule and Chemical Bond
Periodic Properties of Elements

Section B: Organic Chemistry

Chemistry of Elements and Compounds

Section C: Physical Chemistry

State of Matter
Energetic
Chemical Equilibrium

Zoology Syllabus

Histology
Anatomy and Physiology
Reproductive System
Developmental Biology
Diversity of Animal Life
Genetics and Evolution (Fundamentals only): (symbiosis)

Botany Syllabus

Anatomy and Physiology of Plants: Meristems-Plant growth and development.
Internal and external regulators of growth and development in plants
Internal structure of stem and secondary growth
Xylem and Phloem-their cell elements and functions
Internal structure of dicot and monocot leaves photosynthesis.
History, Importance, Factors and mechanism
Transpiration and respiration
Internal structure of dicot and monocot roots
Absorption and cell water relations, transport of water and minerals.
Tropic and turgor movements
Botany and Human Welfare