I just bought a chineese tablet and Google and Google related things don't work . I need to install the normal OS available in India. I have no idea what to do and I can provide any info I can. I will give 300 SB Points for help
So what is the phone company model no etc.. current version
you will need to check if a custom rom (like LineageOS is available for your phone else you are not much in luck
you should check on XDA froum for that
then you need to root and dont use malware like kingroot etc (they install backdoors)
then install a custom recovery like TRWP etc
there is high change of phone getting bricked so be very very careful!