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Yes, marks v/s rank will definitely change due to the total being changed from 360 to 300. On scoring the same marks, you have high chances of getting rank better than previous years' (but it is not necessary due to being multiple slots).
To check your expected rank and percentile, you can make use of the following link:
JEE Main Rank Predictor - Know your expected IIT JEE Main 2020 Rank by ...
Predict your top engineering college admission chances based on your JEE Main All India Rank & NTA Score.
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