If you're looking for a downloadable PDF version of GRB Physics for Competitions Vol 2, here are a few helpful posts and resources that might aid you:
Relativistic kinematics and causality
GRB has rebranded some content under "GRB New Millennium Physics for Competitions" . Volume 2 of that series is identical in problem sets but updated with JEE Main 2020-2023 problems. grb physics for competitions vol 2 pdf
Radiation mechanisms
: Detailed analysis of Ohm’s law, Kirchhoff’s laws, and complex circuit problems. Electrostatics If you're looking for a downloadable PDF version