Hello,

The syllabus of JEE Mains 2020 is same as that of Class 11th and 2th.

All the chapters of NCERT Class 11th and 12th are included in JEE Mains Syllabus.

Important Topics from which questions are asked every year are -

In Physics

1. Work Power Energy
2. Rotational Motion
3. Gravitation
4. Thermodynamics
5. Current Electricity
6. Magnetism
7. Electromagnetic Induction and AC
8. Optics
9. Modern Physics

In Chemistry

1. Atomic structure
2. Chemical bonding and molecular structure
3. Chemical thermodynamics
4. Solutions
5. P Block elements group 13 to group 18 elements
6. d- and f - block elements
7. Co-ordination compounds
8. Organic Chemistry Full

In Maths

1. Integral calculus
2. Three-dimensional geometry
3. Differential equations
4. Vector algebra
5. probability
6. Trigonometry
7. Co-ordinate geometry
8. Permutations and combinations

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Hope this was helpful.