The subject is called I.T. in English ('informatique' en français). So you would say:
'I was studying I.T.'
27 de agosto de 2014
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It's: I was studying Informatics (the field of study). I was studying *at* Informatics means that the place was called "Informatics".
Also, always capitalize the first person pronoun, "I".
27 de agosto de 2014
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