The correct spelling of the phrase "study at excessive" is actually "study excessively." The word "excessively" is spelled with the IPA phonetic transcription of /ɪkˈsɛsɪvli/. This word means to study or do something to an extreme or unreasonable extent. While the phrase "study at excessive" may seem grammatically correct, it is not commonly used or recognized. It's important to pay attention to correct spellings and use of language to ensure clear communication.