UPSC CSE Mathematics Optional PYQs & Tests
IMS 2015 Test Series:https://drive.google.com/folderview?id=0B02P0b7U7zOhaThteUx6VmdtYjg
IMS 2016 Test Series:https://drive.google.com/folderview?id=0B02P0b7U7zOhN2M0OWd4Ynp0RVE
IMS 2017 Test Series:https://drive.google.com/folderview?id=0B02P0b7U7zOhUjlyeXU2T3h2bDg
IMS 2018 Test Series:https://www.dropbox.com/sh/njorjy9f3s6w4uv/AADpeKoCxTzeFi_9whPWmJi3a?dl=0
Previous Year Solutions:
https://drive.google.com/folderview?id=1iU2g_mJKROlX0pPx_VHJlIhVnzDyUsny