The following units from Physics will be covered in JEE Main:

Optics, Dual nature of matter and radiation, Electrostatics, Thermodynamics, Laws of motion, Communication systems, Electromagnetic induction and alternating currents, Electromagnetic waves, Physics and measurement, Kinematics, Oscillations and waves, Atoms and nuclei, Current electricity, Magnetic effects of current and magnetism, Properties of solids and liquids, Electronic devices, Kinetic theory of gases, Work, energy and power, Rotational motion, Gravitation.

Here are some tips:
1. Touch every topic.
2. Find out your weak areas as well as the topics that you find easy.
3. Divide your time and initially, be thorough with the topics you find easy. Make it a point to leave enough time to work on your weak areas.
4. While working on the weak areas, make sure you understand what you are studying. If you don't understand at one go, go through it again and refer to other sources apart from the textbook. A little discussion with friends might help too.
5. Take notes. Reading the entire text all over again is not very much time saving.
6. Revise. Revision is always the key.
7. Make it a point to practise sample papers and previous years' question papers regularly. They help you understand the exam pattern better and give you an idea of the topics that should be given more priority to. However it is always a better idea to cover the entire syllabus. It is just a matter of organising your time well.

All the best!

It is always better to cover the complete syllabus in Physics for JEE Main . However, on the basis of the past experience I would suggest to you which are the most important topics in Physics which you just cannot ignore, the other ones are important topics and the other ones are those which do not hold as much importance but you cannot afford to ignore it.

Most Important Topics in Physics

1. Electro statistics
2. Oscillation and waves
3. Modern Physics
4. Optics

Relatively Important Topics

1. Magnetics
2. Electromagnetic Induction and AC
3. Current Electricity
4. Waves

Other Topics

1. Physics and measurement
2. Dual nature of matter and radiation
3. Communication system
4. Gravitation
5. KTG

I would also suggest that you go through the link which I am providing you as it also mentions the list of books from where you can study as well other preparation tips.

JEE Main Preparation Tips for Physics

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