hey, found this vid, theyve got a bunch of different sites you can download stem files and start mixing, lets get it!
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Hi Pulkit,
on the website below you find hundreds of multitracks to practice your mixing with:
https://cambridge-mt.com/ms/mtk/

And if you join the Mixdown Training Room on this site, you can join in on making a mix every week, getting feedback from others and give feedback to others. It's fun and very good for practice and learning.

Thanks @Janus Oshana & @Aart dB. I just joined Mixdown Training Room. How does this works?

Pulkit, if you are on the page from Mixdown Training Room you scroll down until you find the post from Magghy Ji (the moderator) New mix for the week, or try this link:
http://www.soundgym.co/space/talk?id=GD2LI6086CM&t=JYG5ECPYLHU
There you'll find instructions, and a link to the download. If you have the time you can start rightaway. Posting your mix is on sunday. Or else, every week on tuesday there is a new mix from the week.
If you scroll further sown you can listen to previous mixes and read the comments to get an isea.

Awesome @Aart dB. Thank you so much :)

I think Warren Huart (Produce like a Pro) sometimes gives free multitracks, try google him