Dear Aspirant, JEE Advance marks is quite a relative term. It would be great that you focus on your preparation rather than worrying about your rank. According to previous year cutoffs, closing rank for Engineering Physics at IIT Bombay was around 990 and the rank you are targetting is around 200 which is quite good and safe to get admission in this branch. You can check out here for the marks(it is based on previous year's cutoff:- https://engineering.careers360.com/articles/jee-advanced-cutoff . All the best!