Hello aspirant , 

Looking at last year stats the cutoff for jee mains for sc category was 29 marks . You can use the rank predictor to learn and predict  about your and college . I am providing you the link below you can use it to predict your rank .

https://engineering.careers360.com/jee-main-rank-predictor

You can use it for predicting your college

https://engineering.careers360.com/articles/jee-main-cutoff

Results would be out by 30 April so you can check after that also