A: I went all-out preparing for the final exams, but...
B: Take it easy, dear. I know you have tried your best.
go all out
exp. To put forth the utmost amount of energy, effort, enthusiasm. （全力以赴，尽力而为）
e.g. You'll be going against a state champion in the next match, so you'll have to go all out if you want to beat her!
e.g. The company went all out for Sam's retirement party, making it a gala affair and sparing no expense.
e.g. If I had the choice over again, I would go all out for a degree in the Humanities and specialize in teaching.
e.g. I had to go all out to limit my losses.
e.g. I have to prepare for next week's speech contest.
e.g. In high school, students have to prepare for the entrance examination to university.
2.take it easy：放松，别紧张
e.g. He was going to take it easy when he got back.
e.g. It's nice to sit down and take it easy after a hard day's work.
3.try one’s best：尽力
e.g. I'll try my best to procure you that original French novel.
e.g. We must try our best to lay his doubts.