Re: At/in the same?
I'm glad someone else spotted that you had completely rewritten your first post. That is not a good idea. The rest of your original post has now gone and a lot of our responses now look like nonsense.
Originally Posted by Nima1000
As I said in my first reply "They used to go to the same school" is correct.
Remember - correct capitalisation, punctuation and spacing make posts much easier to read.