I am preparing for NEET but my physics is worst. By preparing which topics I can get 120+ marks in physics?

Now less than a month is left for Neet and now you should focus more on important chapters that means which carry more weightage. Easy chapters in Physics such as Physical World and measurements, Optics, Atom and Nuclei, Electromagnetic waves, Gravitation, Behaviour of Perfect Gas and Kinetic Theory, waves, laws of motion. These chapters are comparatively easier than all other and not long too. So it won't require more than one week to prepare properly these chapters. After you done with this, you can move on to some important chpaters that means which carry more marks and weightage and many questions are asked from them. Such as Thermodynamics, Electrostatics, Electronic Devices, Dual Nature of Matter and Radiation etc. So for scoring at least 120, you must focus on both easy chapters and Do or Die chapters, cause only a few questions will be asked from those easy chapters. More weightage is for the important chpaters. Try to build your concept, understand the mechanism, you still have some time for the exam. If you complete all these before the exam, give mock test and solve previous years' question papers. This will give you an idea what type of questions are usually asked. Write down all the formulae in a notebook which you can access whenever needed.