𝗦𝗵𝗿𝗲𝗻𝗶𝗸 𝗝𝗮𝗶𝗻 - 𝗦𝘁𝘂𝗱𝘆 𝗦𝗶𝗺𝗽𝗹𝗶𝗳𝗶𝗲𝗱 (𝗔𝗽𝗽 𝗹𝗶𝗻𝗸) :
https://play.google.com/store/apps/details?id=co.kevin.nxpgd
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GATE Mathematics books-
1) GATE Academy: https://amzn.to/3sGZR7O
2) Made Easy: https://amzn.to/3sDYhDv
3) Ace Academy: https://amzn.to/3kanEZO
4) IES Mater: https://amzn.to/3gpJtmY