Students who review notes achieve more than those who do not.
Frequent reviews aid your recall of information by transferring information from short-term memory to long term memory.
The more often you read or hear something, the easier it is to remember. With only one exposure to information (during lecture), most information is lost within the first 24 hours. Reviewing notes within one to two days reduces the information you will forget and thus have to relearn prior to a test.