According to Gokulnath, yesteryear IISc admit, IISc is going to resume campus activity from April onwards. So this year classes should be offline. No idea about IIT B, depends on how their govt handles the new corona situation.
IISc is not doing direct admits this year. Even at your rank, there will be a written test by CSA for mtech TA starting this year. There already was one at CDS for their course program. Check the IISc admissions page for more details and join the GO FB group if you can.
Arjun sir says toppers use the GO predictor every year. So I think your rank is a safe possibility, barring answer key changes due to challenges.