If the customer service of the issuing bank tells you that it has been approved, the cardholder can cancel the card at the bank counter with his ID card and credit card. After account cancellation, the cardholder will be a new user when he applies for a credit card next time, and he can also enjoy the rights and interests of new users.
If the cardholder's credit card has been used for a period of time, but he regrets it, he can also apply for cancellation of the card and account.
However, please note that the cardholder must pay the bill and annual fee in full before canceling the card, otherwise the cardholder's credit history will be affected.
Personally, I still advise you not to apply for a credit card, because you are still a student and have no financial ability. It's not too late to wait until you have a job.