If you have a score of 40 percentile then unfortunately you won't be able to qualify JEE Mains because last year the lowest percentile cutoff score was for ST Category candidates which was 44.33 percentile..so there is no chance for you toh get qualified in JEE Mains even if you come under ST Category. So it's better to focus upon the upcoming April Attempt so that you may get a good score and qualify the exam to become eligibile to appear in Advanced and perform well in it.
Thank you..

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