Securing anywhere above 75-80+ in JEE Advanced, you have fair chances of securing a SC Rank in Top 3k, and a seat in one of the IITs. Try closing in near 100, for excellent prospects during Counselling among Top IITs during JoSAA, with a much higher SC Rank between 1-1.5k.

For more information about JEE Advanced Cutoff do follow the link below

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