Hey!

Firstly, before you start with your preparation just go through the syllabus first and then plan accordingly.

Physics, Chemistry, and Maths are three main subjects which are covered in jee advance exam. so, you have to focus on each subject equally. DO NOT focus on only one subject.

whatever you have studied in class 11 and 12 is very important for jee advance. keep revising those concepts and keep practicing exam as it will help you alot in JEE advanced preparation. NCERT books are the best source of preparation for your exam. but along with that other books are also important from exam point of view.

MOST IMPORTANTLY, Keep practicing previous year question papers. you can also register yourself for online mock tests. Practice as much as you can.

- PHYSICS:  physics mainly focuses on - waves and sounds, capacitors and electrostatics, fluids, mechanics and electromagnetism (this part is important) , heat and thermodynamics ( numerical based on basic laws), electromagnetic.

BOOKS: 1. DC PANDEY's understanding physics

2. HC VERMA'S concept of physics

- CHEMISTRY: Go through your NCERT  again and again for chemistry. along with that, Organic chemistry covers your 40-45% of questions where mostly questions are applied. along with that,  qualitative Analysis, Chemical equilibrium in physical chemistry( learn the formulas in this part),  coordination chemistry and chemical bonding in inorganic chemistry ( understand concepts ).

BOOKS: 1. for inorganic chemistry your NCERT books are enough. you can also refer JD Lee for metallurgy and qualitative analysis.

2. For Physical chemistry you can refer GRD books by OP tandon (for both practical and theory questions)

3. For Organic chemistry you can take help from Arihant (theory) and advance problems in organic chemistry by himanshu pandey.

3. MATHEMATICS : Maths requires a lot of practice for perfection. keep solving questions and you can easily handle this part in your exam. some important topics are,  Complex numbers, probability, Matrices in algebra, definite integral in calculus, circle , parabola, hyperbola in coordinate geometry, functions, continuity and differentiability, functions, vectors and 3D geometry, Quadratic equations and expresssions.

BOOKS: You can refer cengage's mathematics , Arihant (for calculus) or differential and integral calculus by N. piskunov, advance problems in jee.

you can also refer Arihant 39, Practice previous year question papers. you can also take help from video lectures but do not refer different youtube channels or sources otherwise you'll get confused.

Before everything, just remember that you dont have to stress yourself . Eat well, Keep yourself Well Hydrated and do not refer end number of books. just a few days  are left for your exam so try practice as much as you can. DO NOT PANIC , just practice and as much as you can . Quantity doesn't matter Quality matters. so, Hard work and Smart work both are important.

All the best!

No it is not enough for JEE Advanced. NCERT is might be best for CBSE exams, but if you appear in JEE Advanced you must study with all India syllabus based books and also practice books like Dinesh Objectives etc.