There are a variety of synonyms for the phrase "study at usual," each with a slightly different connotation. "Maintain regular study habits" suggests a consistent approach to studying, while "stick to a routine for studying" emphasizes the need for structure. "Adhere to customary study practices" implies a tradition or established pattern of behavior. "Follow a standard study schedule" may be more formal, whereas "keep up with typical study habits" is more colloquial. Regardless of the exact phrasing, these synonyms all convey the importance of consistency and dedication when it comes to academic study.