"Studies again" is a descriptive phrase that implies a repetition of academic or scholarly work. Some synonyms for this phrase can include "revisits," "reexamines," and "reviewing." Other possible alternatives include "retakes," "relearns" or "retrains." If one is wanting to emphasize the aspect of a thorough and focused study effort, they could also use the phrase "delve deeper." Whatever terminology is used, it's important to recognize the value of re-engaging with one's studies as a means of maximizing learning outcomes and refining one's skills and abilities.