Hi Udaykiran,

According to JEE Advanced 2018 cutoff marks the minimum aggregate marks required for SC candidates was 45 marks. And according to JEE Advanced 2017 cutoffs it was 64 marks. And for 2016 JEE Advanced it was 38 amrks. so considering the above three years cutoffs your expected cutoff marks is around >=55 marks. For 84 marks you can get a rank around 900 - 1000. so you have high chance of getting IIT Bhubaneswar, IIT Bombay (civil,physics,metallurgical) IIT Guwahati and others but branches like CSE , ECE will be difficult to get.