how many marks required to get admission in iit bombay in jee advanced for sc category

The cutoff changes every year, as it depends on few factors such as number of candidates appeared, number of seats available, difficulty level of the examination etc. Depending on last few years, the cutoff for aerospace engg, computer science engg, electrical engg, mechanical engineering is low comapred to other streams
You can check the list of detailed cutoff for last few years i.e. 2018, 2017, 2016 etc.
http://engineering.careers360.com/articles/jee-advanced-cutoff-for-iit-bombay