Hello,

The important topics for JEE main are:

Physics:

• Rotational Motion
• Thermodynamics
• SHM
• Electrostatics
• Magnetism
• Optics
• Modern Physics

Chemistry:

• Chemical bonding
• Electrochemistry
• Coordination compound
• Salt analysis
• Ionic equilibrium
• Thermodynamics & thermochemistry
• Aldehydes and ketones
• Aromatic hydrocarbons
• GOC isomerism
• Liquid solutions
• Alkyl halides and aryl halides

Math:

• Complex Number
• Conic Section
• Circle
• Calculus
• Vector & 3 D
• Probability
• Trigonometric Equation
• Properties of Triangles
• Quadratic Equation
• Sequence and Series
• Permutations and combination

Study the important topics and practice the numerical. Also, solve the previous year question papers. By solving those you will be able to know more about the exam pattern, question difficulty. Furthermore, stay healthy and don't panic.

You can get the previous year papers from the link below

https://engineering.careers360.com/articles/jee-main-question-papers

Also, to know more about the subject with weightage check the link below

https://engineering.careers360.com/articles/jee-main-syllabus-weightage

Good luck!