Hello Aspirant,

See there is no alternative of NCERT because all the basics for any concept are mentioned in the NCERT books and also the JEE-Main syllabus and JEE-Advance syllabus is based on NCERT so it would not be replaced with any other book. You can use MTG Fingertips but along with NCERT because without NCERT it would be very difficult to prepare for such national level entrance examinations so I am enlisting down some best books for preparation of JEE-Main and JEE-Advance 2021 :-

@Physics

• Concepts of Physics-H. C. Verma
• Fundamentals of Physics-Halliday, Resnick and Walker
• Problems in General Physics-I. E. Irodov
• University Physics-Freedman and Young
• Understanding JEE physics series-DC Pandey
• Problem In Physics-SS Krotov

@Mathematics

• Higher Algebra-Hall and Knight
• Coordinate Geometry-S.L. Loney
• Differential and Integral Calculus-N. Piskunov
• Calculus and Analytic Geometry-Thomas and Finney
• IIT Mathematics for JEE Main & Advanced-M.L. Khanna
• Course in Mathematics for IIT-JEE-Tata McGraw Hill publication
• Problems Plus in IIT Mathematics-A Das Gupta
• Trigonometry-S L Loney

@Chemistry

• Modern Approach to Chemical Calculations-RC Mukherjee
• Organic Chemistry-Solomons and Fryhle
• Concise Inorganic-J. D. Lee
• Organic Chemistry-Morrison and Boyd
• University Chemistry-Freedman and Young
• Physical Chemistry-N Awasthi
• Arihant's Practice Book Chemistry for JEE Main And Advanced-R.K Gupta

For complete details kindly check out the link given below :-

https://engineering.careers360.com/articles/jee-main-preparation-tips-for-january-exam

You can also check out the JEE-Main knockout package for preparation of JEE-Main 2021 from the link given below :-

https://learn.careers360.com/knockout-jee-main-april/?product=27&icn=knockout-jee-main-2021-january&ici=

For JEE-Advance :-

@Physics

• Concepts of Physics by H C Verma (Vol-1 and Vol-2)
• Fundamentals of Physics by David Halliday/Resnick/Walker
• IIT JEE Physics by Arihant (35 years Chapterwise Solved Papers 2013-1979)

@Mathematics

• Objective Mathematics By R.D. Sharma
• Plane Trigonometry and Coordinate Geometry (Two Books) by S.L Loney
• Problems in Calculus Of One Variable by I.A.Maron
• Integral Calculus for IIT-JEE by Amit M Agarwal (Arihant Publications)
• A Text Book of Algebra For JEE Main & Advanced by Dr. SK Goyal (Arihant Publications)

@Chemistry

• Physical Chemistry by OP Tandon
• Modern Approach to Chemical Calculations by R.C. Mukherjee
• Organic Chemistry by O.P. Tandon
• Organic Chemistry by Paula Bruice Yurkanis
• Organic Chemistry by Morrison & Boyd
• Inorganic Chemistry by J.D Lee
• Inorganic Chemistry by O P Tandon

If you are preparing for JEE-Advance then you can check out the link given below for best preparation tips :-

https://engineering.careers360.com/articles/jee-advanced-preparation-tips-physics-chemistry-and-mathematics

You can also check out the complete JEE-Advance 2021 syllabus from the link given below :-

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

I hope this information helps you.

Good Luck!!

See I would say if you are considering the NCERT Fingertips by MTG then you should know that its absolutely for the boards level and not for the Mains And Advanced level. It may sound contrary to you but to build concepts you can't rely on that. Now if you want to test your understanding at a moderate level for JEE MAINS then consider it but for Advanced you shouldn't consider it.

I hope this helps. All the very best for your future endeavors!