Recently, dad asked me to practice hard pen calligraphy. I don't want to practice, but I have to. But he is particularly anxious and gets angry before practice. ...

If the arm can't twist the thigh, you can only keep practicing.

But pay attention to dad's expression when practicing, and interrupt him when he is angry, such as asking him how to write this, can you teach me, and so on.

Also, you can have a serious talk with your father and say that his anger will affect your interest and quality in practicing hard pen. He's just a character. He won't be angry with you when reason has the upper hand.