If you are preparing for JEE Main below are the topics in which you should focus more as they carry more weightage in the exam. You should read NCERT books completely as syllabus is based on them and you can also get direct questions from NCERT books. Mathematics- Coordinate Geometry Continuity/ Differentiability, Limits Complex No., Quadratic equation Integral Calculus Sequence and Series Trigonometry Physics- Current Electricity Electrostatics Optics Heat and Thermodynamics Law of Motion Waves Simple Harmonic Motion Chemistry- Transition Element and Coordination Chemistry Periodic Table and Representative Elements Gaseous State Atomic structure Amines Solution and Colligative Properties General Organic Chemistry Carboxylic Acids and Derivatives Hydrocarbons Carbohydrate, Amino Acids and Polymer All the Best!!