Hi

It is very difficult to predict the actual cutoff of jee mains as it varies on several parameters like number of students appeared for exam, how tough the paper was along with how many seats are available in different universities and performance of candidates appeared.  Based on previous years cutoff it is expected that 45 to 50 percentile is needed for sc category candidates as the qualifying percentile for JEE mains.

For more information visit:

https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-cutoff/amp

Hope this helps