The cut off for admission in KGMU, Lucknow under the State quota for the SC category in the previous year 2018 was a rank of 42372 and a score of 434 marks.
The cut off changes each year due to several factors like level of difficulty or level of Competition etc. This year as the paper was easier the cut off based on marks will be higher than before.
Considering your rank, and the previous year last rank you seem to have no chance of Admission here.
You can use the link below to check previous year trends.
Best of luck.
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