Hello Rajesh,
No,the subject wise qualify cut off doesn't change generally.It will always remains the same but the cut off of the aggregate total marks may change.
Determining Factors of JEE Advanced 2019

The following factors will be checked by the authorities while preparing the cutoff of JEE Advanced 2019:

Previous years cutoff trends

The difficulty level of JEE Advanced 2019

Total number of applicants for JEE Advanced 2019

Number of seats available for admission

Performance of the candidates in the exam

Joint Entrance Exam Advanced

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