The head part of chair is torn, how should I fix this
Can you post a picture so we can see the damage, so we can better advise.
Can you sew it? You don't mention what material your chair is made from or where the tear is. It is easier to sew a tear in the seam and it can almost be unnoticeable. If it's in the middle of the headrest you will see the repair.
Here's a link on repairing tears in leather.
Glad to hear it! I hope it works for you!
Here's a video tutorial: https://www.youtube.com/watch?v=sJCGK1BN-Ms
You can buy leather and vinyll repair kits at the auto parts store or auto parts department of stores