We were in college together.

We went to the same college.

We went to the same university. (на английском college и university - это часто одно и то же)

- Where did you meet Derek? / Где ты познакомился с Дереком?

- We were in college together. / Мы вместе учились в университете.

They are a year ahead in school. 

I've always been a good student.

I'm in forth grade.

- What grade are you in? / В каком ты классе?

- I'm in forth grade. / Я учусь в четвертом классе.

Learn fro me.

I'm in my fourth year of college.

She's in school.

She goes to school.

I'm doing well at school.

I'm in my first year of med school.

I'm studying just for the hell of it.

I'm studying just because I like it.