I myself normally use at in a sentence such as "I want to study at the Stanford University."
But when I saw someone wrote "I want to go to study in the Stanford University," though sounded a little odd, I didn't feel that it's absolutely wrong. Then again, I'm not very sure.
Can we use either, or should we always use "at", or always use "in"?
PS. A closely related phrase, but I expected that the answer would be the same, is "continue my study/education at" or "continue my study/education in"?