I got a 4.23 rating in TCS in my past project, and in my current project I got 4.56. Which band should I expect?

I will be brutally honest, band and rating in TCS work independently. It depends totally on your project, team leader, manager, and HR.

The projects are given a fixed number of bands to distribute. So EoD they managers and leads decide who gets what. A good Rating does not guarantee a good band. But a bad rating pretty much ensures a bad band.

Eg: last year appraisal colleague had 4.3 and ended up with C band but sister project 3.9 colleague got B band.

But yeah anything below 3.6 is pretty much a C band.

A or B as rating is inversely proportional to banding

A