Click on the link YouTube Premium Free Subscription (https://www.youtube.com/...em) to redeem the Offer.
Enter your activation code.
Click on ‘Try it Free’.
Add a form of payment, and you will be billed Rs 150 as test amount.
Once you are done, your Free Subscription for 6 months gets activated.
Add GV of playstore worth 150 rs if you don’t want to add your card.