It is an addiction to delay study until the last minute.
Switching from one task to another while studying takes away focus and affects memory and comprehension.
Social media, TV, and so on are major interruptions in concentration. Study efficiency dwindles.
Sleepiness also plays an essential role when trying to establish solid memories during relaxation. As indicated, insufficient sleeping time destroys studying and subsequent performances.
Extremely little studying time & disorganised tasks bring the performance of students to a low level.
Poor understanding due to scattered material.
Self-doubt coupled with a pessimistic attitude drags down morale and confidence, which in turn affects performance.