急!!!!聽日之前就要答案!!!plz!!!!

The correct sentence:I graduated from Happy Primary School .

The format:Someone graduate(d) from (school, college or university) with (a diploma or degree) in (certain subject or year).e.g. She graduated from Yale with a B.A. degree in Political Science.        She graduated from Yale with a B.A. degree in 1990.Someone graduate(d) with (honour) in (certain subject).e.g. He graduated with first-class honours in physics.Someone graduate(d) in (certain subject) at (university).e.g. She graduated in law at Yale. 
Other format:I had better graduate with at least three point six or I won’t get into Harvard Law School . (Note: three point six is the GPA score in American orCanadian universities) 
Try to learn collocation in English. (the way in which some words are often used together). Hope that can help.

Both of the sentences are wrong.
It should be : I graduated from Happy Primary School.

If you use "in",you should mention a time after it.

So does "at".