Written Permit test or in some states the Knowledge test
Each state is different. For example, I found in California it is:
There are 46 questions on the test. A passing score is at least 38 correct answers. )82.6%) You have three chances to pass the test. If you fail, you must wait 7 days before taking it again.
But in Oklahoma it is:
The present Oklahoma written drivers test is made of 50 questions. You must get at least 40 questions (80%) correct for a passing score. You must not try taking the written driver's test on the same day. You need to wait at least one day.