You can have a test with randomized questions, so there are many different task combinations for that particular test and not every candidate gets the same tasks.
This feature can be useful especially for graduate/college recruitment campaigns as candidates who know each other would not be able to easily share hints/solutions.
You can read more about our Task Randomizer here.
If you have any additional questions about Task Randomizer or would like to have it enabled on your account, please reach out to your Customer Success Manager or contact us at support@codility.com.