It's a good time you are in college at university and you're almost done. You've finished your last class.

你在大学度过了一段美好时光，你快要完成学业了。你已经上完了最后一门课。

I'm about to 课堂 - SpeakingMax英语口语达人

I remember when I went and I had a great time.

我记得我读大学的时候度过了一段美妙的时光。

How about 实战 - SpeakingMax英语口语达人