There are advantages to thinking in different ways. There is usually one correct answer and one best way of finding it. There are many ways to succeed. There can be successful elements in wrong answers and unsuccessful work. Mistakes mean you haven't learned or studied carefully enough.
Mistakes are natural steps in learning and can point the way to success.
Students have an opportunity to show what they know on the test. Students should have many opportunities and ways to show what they have learned. Faster is better. Doing things faster means you are smarter. The best students are independent.