If your waiting list number lies within the first 100 then you have more chances to get into that. Most of the students that get into the first list have a waiting list number below 100.
I have a friend who is an alumnus of SCMS, Pune and she had many classmates who got admission through the 2nd and 3rd list. Most of them had a rank within 150.
Every year SCMS usually publishes a 2nd and 3rd list. Usually, the 2nd and 3rd waiting list comes out by 10 days or a week after the fee payment is done by the first waiting list candidates.
According to the current cutoff trends, you have a good rank and a valid chance to secure admission at SCMS.