The only way to improve your oral comprehension - beside going to an English-speaking country which I wish you will be able to do soon - is to listen to real-life conversations from speakers from all over the world. Here’s your chance to listen to tons of conversations, dialogues and other real stuff English.
Below are a few websites which I strongly recommend for your practice. They all offer short quizzes afterwards to check your level of understanding and they are listed by difficulty level or themes. Have fun!