In April, we've released a new feature that will now allow you to assign different weights to the tasks in your test. You can enable this feature during the test creation process or by duplicating a test that you're already using.
This feature will allow you to put a higher emphasis on candidates that are capable of solving tasks that are more important. You can read more about Weighted Scoring here.
If you have any feedback, then please reach out to us at support@codility.com