Now only a month is left for Jee Main. However, it is not difficult to score 90 marks in Physics. You need determination and Hard work. Instead of choosing a random topic from the syllabus, you must break your preparation into sections. Sub-topics from each section should be selected and then strategy on clearing concepts must be made. You can make short notes on the topics that you have find difficult to understand.Never leave any concepts doubtful or unsolved. Once done with the syllabus and concept clarity, you should move towards solving previous years papers. Give mock tests as much as possible. You must start your preparation with NCERT textbooks as these are the best for having a clear concept over all the topics. Once you done with NCERTs you can go on solving HC Verma. HC Verma has a number of standard problems that you must solve. During last days, focus more on the important chapters. Electrostatics is a high scoring chapter and almost 3 to 4 questions are asked every year. Oscillations, waves, Optics, Magnetics, Current electricity are some important chapters.