I want to qualify jee mains with good marks so what can I do now to prepare for it

In order to get good marks in JEE Main your base should be strong. You can take help of NCERT books to make your concepts strong. It is recommended to solve exercises which are given at the end of the topics in NCERT. You can also get direct questions from NCERT. Apart, from NCERT you can refer below books Physics HC Verma DC Pandey Chemistry Organic Chemistry- Morrison Boyd/O.P Tandon Modern Approach to Chemical Calculations- R.C. Mukherjee Numerical Chemistry- P. Bahadur Concise Inorganic Chemistry- J.D. Lee Mathematics R.D. Sharma M.L. Khanna You should focus on important topics and try to complete then first as they carry maximum weightage. You can check the topics below 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 You should refer previous year papers as well to understand the exam pattern and level of questions. Solve as many as mock test series to to analyze your preparation level at regular period of time. All the Best!!