ace: make an "A" on a test, homework assignment, project, etc.

"Somebody said you aced the test, Dave. That's great!"

all right (1): expression of reluctant agreement.

A: "Come to the party with me. Please!"
B: "Oh, all right. I don't want to, but I will."

all right (2): fair; not particularly good.

A: "How's your chemistry class?"
B: "It's all right, I guess, but it's not the best class I've ever had."

all right (3): unharmed; in satisfactory condition.

A: "You don't look normal. Are you all right?"
B: "Yes, but I have a headache."

and then some: and much more besides.

A: "I'd guess your new computer cost about $2,000. "
B: "It cost that much and then some because I also bought extra RAM and VRAM."

antsy: restless; impatient and tired of waiting.

"I hope Katy calls soon. Just sitting around and waiting is making me antsy."

as easy as pie: very easy.

"I thought you said this was a difficult problem. It isn't. In fact, it's as easy as pie."

at the eleventh hour: at the last minute; almost too late.

"Yes, I got the work done in time. I finished it at the eleventh hour, but I wasn't late.