For 2017-2019 Batch, waitlist moved till 65 in General, 41 in NC-OBC, 20 in SC and 19 in ST category. For 2018-2020 batch, waitlist moved till 33-35 in General. There is a concept of buffer calls also comes into play when we talk about the waitlist movement.
Usually, a waitlist number less than 40 is considered safe for IIM Bangalore. Therefore, aspirants with sub 40 waitlist numbers can be reasonably certain of getting selected.
All the best.