NEET exam is one of the most competitive entrance exams for medical aspirants in India. The exam is conducted by National Testing Agency (NTA) and the syllabus is based on the NCERT books of class XI and XII. The exam consists of 180 multiple choice questions with a total of 720 marks. Here is the chapter-wise weightage of NEET exam:

1. Physics
- Mechanics: 25%
- Thermodynamics: 12%
- SHM & Waves: 12%
- Electrostatics & Capacitance: 8%
- Current Electricity: 7%
- Magnetism & Magnetic Effects of Current: 10%
- Optics: 10%
- Modern Physics: 16%

2. Chemistry
- Organic Chemistry: 28%
- Inorganic Chemistry: 22%
- Physical Chemistry: 20%
- Environmental Chemistry: 6%
- Biomolecules: 5%
- Chemistry in Everyday Life: 4%
- Polymers: 3%
- Coordination Compounds: 2%

3. Biology
- Diversity in Living World: 14%
- Structural Organization in Animals and Plants: 5%
- Cell Structure and Function: 9%
- Plant Physiology: 6%
- Human Physiology: 20%
- Reproduction: 9%
- Genetics and Evolution: 18%
- Biology and Human Welfare: 9%
- Ecology and Environment: 10%

It is important for students to focus on all the chapters equally to achieve good scores in the NEET exam. However, they should give more time to the chapters that have a higher weightage. Students should also practice previous year question papers and mock tests to improve their time management skills and accuracy.