To crack an exam such as the Joint Entrance Examination Advanced, one to keep a very high level of focus and dedication. There are some very important topics for JEE Advanced and completing them nicely is imperative to get a good rank some of these high weightage topics are:

Chemical Bonding
P Block
General Organic Chemistry
Nitrogen and Compounds
Electrochemistry
Thermodynamics

Trigonometry
Calculus (Diff/Int)
Conic Sections

Magnetism
Electricity
Optics
Modern Physics

Hope I have answered your question. All the best!