Hello Anandv, First of all you should focus on the topic in which you have strong hold, and then you should see the topics from which maximum number of questions comes and which are easy.More over Chemistry of JEE is quite is easy as it has many theoretical aspects,most of the students scores good marks in chemistry and it is quite easy to score in chemistry.

From my point of view, i am tell some of the important and easy topics which i feel from all the 3 subjects.

Chemistry

Bio molecules
Polymer
Chemistry in every day life
Periodic table
P-block
Solid state
Chemical Bonding
Amines

Physics

Current Electricity
Semi conductor
Electronics devices
Wave Optics
Geometrical Optics
SHM

Mathematics

Straight line,Circle,
Parabola, Elipse, Hyperbola
Differention
Integration

Hello Aspirant.

It's nice that you're good at all the subjects that creates the JEE main examination paper. First of all, just tuition and school stuff won't be enough for you to score around 150 or more. You'll need to put in more effort by studying reference books of each subject and also solving as many previous years question papers as possible.

Secondly, there's no definite weightage of any topic in any of the subject. The weightage of any topic changes in every year's paper. It would be great if you study the entire material with full enthusiasm as it'll really help you get more than 150 for sure.

As an example, please have a view of the weightage of topics in each subject in previous years question paper

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

Best of luck

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