How can I have a cheap homemade noise cancellation device?

[A2A] Other than what Aditya wrote, you could also try going to sleep early and wake up early and study when everyone is sleeping. My next door neighbor in IIT Delhi hostel was a year senior to me. He would go to sleep by 9 pm and wake up at 4.30 am and study because it was the quietest time in the hostel. You might try a similar strategy.

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