There are some lessons in physics which are somewhat easy compared to the others and have some weightage. For getting qualified in physics, it's better for you to learn them.

Some of them are   Atomic Physics ,  X-rays ,  Nuclear physics , Waves and Sound, Wave optics , etc...

Dear Aspirant,

If your basics are not good then you can not cover the physics for JEE advanced in 3 weeks. The best you can do is manage to pass the cutoff line and if you want a decent rank, you have  to up your game in the other two subjects.

For preparation of physics in this small period, I suggest you must make a list of the topics you are comfortable with and have some idea. Focus only on those areas and solve the previous year question papers and some practice papers, you can find them online.

Also, keep on practicing the other two subjects with your heart and soul if you want to get a good rank.

Thank you.

Hello Aspirant, In JEE Advanced, you have to qualify aggregate as well as subject wise, so you have to cover all 3 subject, at least upto cutoff marks.

For Physics, First of all take a print out of the JEE Advanced Physics syllabus,as JEE Advanced syllabus is quite different from JEE Main and board, it have extra topics also, many topics which are in JEE Main and Board Syllabus are not in JEE Advanced syllabus, so you need to know which topic you have to study and which not. More over, JEE Advanced questions are not very much easy so, don't start a new topic, just revise and practice the past year questions of the topic which you feel easy and in which you have good commands.