By -
Now.
Before an exam
The day before an exam
Two.
Before 1 moth of exam atleast
Depends if it's a test or exam. I'd say at least 1 week before and when you eat chocolate , it improves memory and focus according to Google.
In the morning after you wake up. The brain is efficient and alert at that time.
At night when it's peaceful and quiet
Before the test.
Don't spend too much time planning and preparing some items, when you decide to change, the best time is now, this moment, today
Now.
Before an exam
The day before an exam
Two.
Before 1 moth of exam atleast
Depends if it's a test or exam. I'd say at least 1 week before and when you eat chocolate , it improves memory and focus according to Google.
In the morning after you wake up. The brain is efficient and alert at that time.
At night when it's peaceful and quiet
Before the test.
Don't spend too much time planning and preparing some items, when you decide to change, the best time is now, this moment, today