Hello aspirant,
If you are preparing for JEE main then you can focus on other 2 subjects so that you  master them and can score at least 100 in each. Then you will get a good collage with your desired stream. Do follow this in every Engineering entrance exam in which there is no compulsory subject wise cutoff. Hence , One can be definitely get ECE without studying chemistry but remember that in first year or first 2 semesters in college the slaybuss for all branches is same which consists of a little chem topics from class 11&12 but still then you can try to get passing marks there.
After this you will never need to face chemistry in your future life.

I hope this helps.
Regards
Madhur

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