Hello Aspirant,

I am enlisting down some important topics which you should study from the syllabus of class 11th or first year for JEE-Main 2021 :-

@Mathematics

permutation and combinations

Limits & Derivative

quadratic equations

Straight lines

sets and functions

probability

ellipse/hyperbola/parabola

@Physics

laws of motion

gravitation

work power engery

circular energy

rotational dynamics

fluid dynamics

waves and oscillations

@Chemistry

equilibrium

mole concept

atomic structure

thermodynamics

chemical bonding

states of matter

periodic elements

For complete syllabus for JEE-Main 2021 kindly check out the link given below :-

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

I hope this information helps you.

Good Luck!!