Advice

For some context...I m preparing for an entrance exam and my goal is to get a good college...and well... nobody in the family has given an entrance exam...like they just go to college through money...and if i get in then like it would boast my career options and all...so few days ago...brother was as usual mocking me by saying "oh u think u are gonna get it ...sure u wish" and well usually I just let it slide but I had enough so I said said "u are yapping a lot for someone who hasn't even given any entrance exam and got in college through daddy's money" and then he said " that's right i did it...it took me effort to born in this family" ...like no kidding he genuinely said that and then he just kept yelling and was using profanities a lot and then I just went to my room as i had to do my preparation...and he started banging on the door and was all yelling and cursing and saying " u think u are gonna get in? YOU?...sure might as well become a ceo u fucking fustilarian" and yeah he just kept going for sometime and then father calm him down and took him away and all...and I was literally trembling like i was on a fight or flight mode...and i just couldn't focus on what I was reading and was trying to just do my work but not a single thing was going in my head...I want to ask like ...how do u calm down like i have much bigger things to focus on than him but like i just couldn't and i don't wanna waste time ...so i just wanna know what to do to calm down in intense situation