Hello Aspirant,

Yes NEET UG syllabus consists for class 11th and 12th syllabus and you need to prepare for class 11th and 12th syllabus thoroughly. Also for your reference I am mentioning down  :-

@Physics

• Physical World and Measurement
• Kinematics
• Laws of Motion
• Work, Energy and Power
• Motion of System of Particles and Rigid body
• Gravitation
• Properties of Bulk Matter
• Thermodynamics
• Behaviour of perfect gas and kinetic theory
• Oscillation of waves
• Electrostatics
• Current Electricity
• Magnetic effects of current and magnetism
• Electromagnetic induction and alternating currents
• Electromagnetic waves
• Optics
• Dual Nature of matter and radiation
• Atoms and nuclei
• Electronic devices

@Chemistry

• Some Basic Concepts of Chemistry
• Structure of Atom
• Classification of Elements and Periodicity in Properties
• Chemical Bonding and Molecular Structure
• State of Matter: Gases and LiquidsThermodynamics
• Equilibrium
• HydrogenS-block Element
• Some p-block Elements
• Organic Chemistry
• Hydrocarbons
• Environmental Chemistry
• Solutions
• Chemical Kinetics
• Surface Chemistry
• General Principles and Processes of Isolation of Elements
• D and F Block Elements
• Coordination Compounds
• Haloalkanes and Haloarenes
• Organic Compounds Containing Nitrogen
• Biomolecules
• Polymers
• Chemistry in Everyday life

@Biology

• Diversity in Living world
• Structural Organization in Animal and Plants
• Cell Structure and Function
• Plant Physiology
• Human Physiology
• Reproduction
• Genetics and Evolution
• Biology and Human Welfare
• Biotechnology and its applications
• Ecology and Environment

For more details go through the link given below :-

https://medicine.careers360.com/articles/neet-syllabus

I hope this information helps you.

Good Luck!!