revise
v.v. to study information again to prepare for an exam. It can also mean to change or improve a piece of writing or a plan.
v. to re-examine and modify a text, plan, or theory to improve accuracy or reflect new information; in British English, to review previously learned material in preparation for an examination.
I need to revise my notes before the big test tomorrow.
The committee decided to revise the safety guidelines after the new report highlighted several overlooked risks.
Scholars often revise their hypotheses as fresh archaeological evidence comes to light, ensuring that their historical narratives remain consistent with the most recent discoveries.
Borrowed from Middle French réviser, from Latin revīsō, from re- + vīsō (“examine”), frequentative of videō (“see”).
The verb is transitive when referring to documents or plans; it can be used intransitively in the British sense of studying for exams.
I am revising for my exam since three hours.I have been revising for my exam for three hours.Learners often use the present continuous with 'since' instead of the present perfect continuous with 'for' to describe the duration of study.