Hey, another Vietnamese here! I was admitted to a Psychology program but admittedly not clinical. I would echo what the previous commenter has said about getting as much research experience as possible (either by doing research, publishing, or presenting). I would recommend knowing who would be writing your recommendation letters and letting them know that you will ask for a letter in the future. Be sure to study for GRE also! If you have any question, feel free to shoot me a message.