I am in the process of putting my modest collection of notes in Physics, Mathematics, and Computation into an ordered site. Meanwhile, I have some notes hosted here.
I also try to put stuff from Coursework at IISER-K here. If you are a fellow student at IISER-K, please do refer to the Library’s PYQ catalog or Centre for Career Development’s Google Drive of material (ask around for the drive link) for (a lot) more.