For jee mains:
Chemistry-
Physical
Surface chemistry + solid state + solutions + electrochemistry + chemical kinetics (4 to 5 questions)
Stoichiometry + atomic structure (2 questions, or maybe 1).
Organic
Open class 11th & 12th NCERT book, byheart all the naming reaction from hydrocarbon to nitrogen contain compd. (2 questions or if basics are clear 3 to 4 questions).
Biomolecules + polymer (1 question only from NCERT).
Inorganic
Co-ordination Compd. (1 question confirm)
Chemical Bonding (1 to 2 questions)
D-F block from NCERT (1 question).
11 to 12 questions
Physics-
Electrostatic + Gravitation (2 questions)
Current Electricity + Electromagnetic field (2 questions)
Modern Physics only from NCERT ( 1 question)
Geometrical Optics + Electromagnetic waves and communication (NCERT) (2 questions)
Revise any topic from 11th syllabus which you know the best (2 questions)
Mathematics-
Vectors and 3-D Geometry (3 questions)
Mathematical reasoning + set&relation + statistics (3 questions) [These chapter are very easy & hardly takes 1&1/2 hr.]
Functions + Limit, continuity + formulas of integrations (2 to 3 questions)
Circle, parabola, ellipse ( 1 to 2 questions, if you include straight line also).
Matrices & Determinant ( 1 question)
Total 11 to 12 questions.

For jee advance:
Physics :
Kinematics Very simple questions are asked. If you keep the definitions in mind, then all questions will be easy
Newtons laws of motion Knowing how to draw a free body diagram will greatly help in solving almost all problems of this chapter
Simple harmonic motion Energy conservation method will be useful in finding time period in even the most complicated cases of SHM
First law of thermodynamics Knowing the statement of energy conservation will help you to solve a number of numericals and theoretical questions as well
Current Electricity A good practice of Kirchoffs law problems will help you to score cent percent in this topic
Radioactive decay The radioactivity decay formula will be the most useful tool in solving almost all the problems

Mathematics :

Conic sections Knowing the formulas well will help you. The parametric form is one of the most useful tool in solving problems of conics
Quadratic Equations knowing the fundamental properties regarding nature of roots / intervals in which roots lie will help you
Progression and series very scoring and simple chapter. Knowing the definitionsand practising ample of problems would be useful
Differentiation Keeping the formulas in mind will help. Geometric interpretation of derivative is an important concept. A number of simple questions are asked which can be done with ease
Vector Algebra Knowing how to visualize the situation will be useful. The concepts of vector and scalar triple products are most scoring

Chemistry :
Alkyl Halides Simple questions based on reactivity / type of reactions are asked and can be cracked easily
Electrophilic aromatic substitution reactions of benzene standard reactions are the most important. Direct questions are asked from this chapter
Chemical Equilibrium- Knowing the basic equation of equilibrium along with a proficiency in solving ideal gas equation problems will definitely fetch you full marks
Chemical Kinetics First order reactions are asked in JEE and are easy if you know the basic definitions
Ores and Metallurgy- Standard questions are asked which can be done easily
Coordination compounds- isomerism is an important but easy topic and you can easily score 100% in this

Hello,

Hope you are doing good.

Coming to your question, We will first see what are the most important topics to be covered in Physics:

• Dimensional analysis
• Geometrical Optics
• Thermodynamics
• Rotational Dynamics
• Kinetic Theory of Gases
• Waves & Sound
• Electromagnetic Induction
• Gravitation
• Electrostatics
• Current Electricity & Heat Transfer

Now the important topics for chemistry are:

• Redox reactions
• Thermochemistry & the Second Law of Thermodynamic
• Solid-state, solutions & gases theory
• Mole Concept & the concept of equivalents
• Carbonyl Compounds & their derivatives
• Chemical Bonding & the periodic table

For Mathematics the important topics are:

• Definite integration
• Matrices and Determinants
• Continuity and Differentiability
• Probability
• Parabola
• Circle
• Area Under Curves
• Differential Equation
• Sequences and Series
• Vector
• Application of Derivatives
• Three-Dimensional Geometrical System

Below I have shared links where you can find more details:

https://engineering.careers360.com/articles/most-important-chapters-of-jee-main

https://engineering.careers360.com/articles/jee-advanced-syllabus-weightage

Hope this was useful

Good Luck

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