help me please!!! can you check my sentenses if its use in daily life

1)
a: James, you look so bad today? what happened to you?
b: I screwed up(the/my) English test >>>> 나 영어시험 망쳤어(korean mean)
a: you're good at English. what's your score?
b: 90 points
a: you crazy! Is it real shit score?>>>> 미쳣어. 그게 망친(나쁜) 점수라고?

2)
a: what took you so long? I waited(for) you for half on hour!!
b: sorry, I helped someone on my way to come here >>>>> 미안. 오는길에 누구 도와줬어.
a: Don't make a excuse(make excuses)!>>>>> 변명하지마!

3)
a: This appetizer have good taste!!!
b: Thank you. Enjoy your meal.
a: wait/Excuse me! what comes with the main dish??
b: Seafood spaghetti and salmon salad will be ready.>>>>해물 스파게티와 연어 샐러드가 준비 될 것입니다

4)
a: What's the problem with this smartphone?
b: Is the battery enough(fully charged)?>>>>배터리는 충분해?
a: Of course
b: I don't know well. I think you have to leave it to service center.>>>나도 잘 모르겠어. 내 생각에 그거 서비스 센터에 맡겨야 될거같애

5)
a: Let me guess your blood-type. I think you're "A" through your character.>>>> 너 성격을 봐서는 A형이라고 생각해.
b: how did you know that? Then, what's your blood-type?
a: I just knew that/By instinct/I gussed>>>>맟혀 봐!