Dear aspirant,
If you have completed whole syllabus of jee mains and you have one month more to exam, then you must revise these following topics in last month:-
1) maths
Straight line in 2d and 3d, parabola, hyperbola, ellipse, complex no., Bionomial theorem,
Probability(class12) , determinant and integration.
2) chemistry
Revise compete organic, p,d and f block , coordination number.
3)physics.
Rotational motion, shm , wave and Ray optics,capacitance , magnetic field.
Just revise these above mentioned topics in last month.
Hope it helps.
Good luck

You are asking for Last Month Preparation, So I will list out only main topics here. These are as follows:

Mathematics:

General Things about Parabola, Ellipse, Hyperbola

Basics of Limits (for ex.: Lt((Sin x)/x) for x -> 0 is 1)

Integration Formulas

Binomial Expansions

Permutation And Combination

Probability

Inverse Trigonometric Functions

Chemistry

Chemical Equilibrium

Chemical Kinetics

Solid State

Chemical Bonding

Metallurgy

s block elements

Basic Nomenclature

Grignard Reagent

SN1, SN2 Reactions (Reactivity, Stability Orders of Organic Compounds)

Carboxylic Acids and Their Reactions

Biomolecules & Polymers

Physics

Basics of Kinematics

Rigid Body Dynamics (+ Centre of Mass)

Current Electricity (+ Capacitance)

Geometrical Optics

Modern Physics

Logic Gates (for JEE Mains especially)

Hello Harsha!!
https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-important-topics-books/amp
Here is the link, which consists of important topics and recommend books for jee mains. Hope this would help you. Thank you!

shm nd nlm or in math calcuas /chem theromodynamics.

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