Hello.
If you want to leave organic chemistry , optics and calculus part of the syllabus of JEE mains.
then you may clear JEE mains but it is little bit difficult to score high marks because some of the units are dependent on these three units if talking about chemistry so some units like  haloalkane, aldehyde ketone, carboxylic acid etc.
Units.
You will also have to leave.
In mathematics if you want to leave calculus part then application of integration , differentiation etc. unit you will also have to leave.
In physics if you want to live optics part that wave optics etc. you will also have to leave.
Best of luck.

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