Answer:
The correct answer is:
cram in last-minute studying - you never know what little details might be useful
Explanation:
Asking teachers a question can be an appealing answer but in most schools and universities, you are allowed to ask certain types of questions regarding the form of the question. A teacher or a professor is permitted of giving you the answer to the question on a test, but he/she is not permitted of explaining what is it that you have to do in your task.
On the other hand, learning on a day of your exam is never good because you can easily mix or forget the important things you studied earlier.
