There are some topics which are the most important and scoring topics. Ideally you should try to cover the entire syllabus well.

Physics :

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

All the very best and good luck:)

There is vast syllabus for  physics and weightages have been dsitributed for JEE mains and advanced as per previous year papers:

For JEE mains the most important chapters are as:

• rotational motion - 6.33%
• units and dimensions -5.33%
• waves - 5.01%
• thermodynamics - 6.33%
• moving charges and magnetism - 6.33%
• semiconductors - 10.67%
• ray optics 5.67%

On the other hand, for JEE Advanced the weightages are as follows:

• oscillation and waves -12%
• electrostatics - 11%
• optics - 11%
• thermodyanmics -10%
• rotational motion - 9%
• laws of motion - 7%

You can get all advanced prepartion tips for Physics below:

https://engineering.careers360.com/articles/jee-advanced-preparation-tips-physics-chemistry-and-mathematics

I would suggest you to go through the below given weightage -

Maths - Inverse Trigonometric Functions Weightage: 2% Circles and Family of Circles Weightage: 6% Sequence and Series Weightage: 5% Applications of Derivative Weightage: 4% Limit and Continuity Weightage: 3% Matrices and Determinants Weightage: 4% Straight Lines and Pair of Straight Lines Weightage: 2% 3-D Geometry Weightage: 5% Probability and Statistics Weightage: 7% Vector Algebra Weightage: 5% Integration Weightage: 8% (Definite + Indefinite integration) Complex Numbers Weightage: 5% Parabola Weightage: 3% Trigonometric Ratios Weightage: 3% Logarithms Weightage: 1% Quadratic Equations Theory of Equations Weightage: 5% Sets, Relations and Functions Weightage: 4% Differentiation 2% Permutation and Combination Weightage: 2%. You should study this properly as concepts from this section will be needed in Probabilty Binomial Theorem Weightage: 1% Locus Hyperbola Weightage: 2% Ellipse Weightage: 2% Fundamentals of Mathematics Solution of Triangle 1%

Chemistry - General Organic Chemistry 9% Alcohol Phenol Ether 7% Redox reactions 6% Chemical Bonding 5% Coordination Compound 5% P-Block Elements 5% S-Block Elements 5% Aldehyde Ketone 5% Solutions 5% Solid State 5% Chemical Thermodynamics 5% Ionic Equilibrium 3% Chemical Equilibrium 3% Surface Chemistry 3% Atomic Structure 2% Gaseous State 2% Transition Elements 2% Polymers 2% Nuclear Chemistry 2% Chemical Kinetics 2% Mole Concepts 2% Amines and Diazonium Salts 2% Biomolecules 2% Alkanes, Alkenes and Alkynes 2% Electrochemistry 2%

Physics - Units and Dimensions Weightage: 2% Measurement of Errors Weightage: 2% Vectors Kinematics Weightage: 1% Newtons Laws of Motion Weightage: 4% Friction Work, Energy and Power Weightage: 5% Electrostatics Weightage: 6% Current Electricity Weightage: 7% Wave Optics Weightage: 5% Ray Optics Weightage: 6% Centre of Mass, Momentum and Collision Weightage: 5% Rotational Dynamics Weightage: 4% Simple Harmonic Motion Weightage: 5% Fluid Mechanics Weightage: 2 5%. Wave Motion and String Waves Weightage: 5% Magnetism Weightage: 6% Heat & Thermodynamics Weightage: 6%.Nuclear Physics Weightage: 5% Modern Physics Weightage: 5%, Circular Motion Weightage: 1% Gravitation Weightage: 1% Properties of Matter, Elasticity Weightage: 2% Sound Waves Electromagnetic Induction Weightage: 3% Alternating Current Weightage: 1% Semiconductors and Electronic Devices 5%.

Hope this helps!!!

Below are the highest weigtage chapters for physics in JEE which will fetch you good marks

Easy and high weigtage chapters

• Work, Energy and Power – Weightage: 5%
• Electrostatics – Weightage: 6%
• Current Electricity – Weightage: 7%
• Wave Optics – Weightage: 5%
• Ray Optics – Weightage: 6%

Below are the important topics but you will get tricker questions. Make sure your basic are clear

• Centre of Mass, Momentum and Collision – Weightage: 5%
• Rotational Dynamics – Weightage: 4%
• Simple Harmonic Motion – Weightage: 5%
• Fluid Mechanics – Weightage: 2 – 5%. Bernoulli’s principle can be easily twisted to ask some tricky questions.
• Wave Motion and String Waves – Weightage: 5%
• Magnetism – Weightage: 6%
• Heat & Thermodynamics – Weightage: 6%. This is one topic that is very important for both Physics and Chemistry preparation in JEE.
• Nuclear Physics – Weightage: 5%
• Modern Physics – Weightage: 5%

If you have time you can go for below topics as well

• Circular Motion – Weightage: 1%
• Gravitation – Weightage: 1%
• Properties of Matter, Elasticity  – Weightage: 2%
• Sound Waves
• Electromagnetic Induction – Weightage: 3%
• Alternating Current  – Weightage: 1%
• Heat Transfer
• Calorimetry
• Thermal Expansion
• Thermo Electricity
• Semiconductors and Electronic Devices – Weightage: 5%
• Communication Systems – Weightage: 2%

All the Best!!