When you purchase a SAL1 certification, your exam attempts are valid for 12 months.

Included in your purchase are 2 exam attempts. If you fail the first exam, you will be able to retake the exam once at no additional cost. You will be able to retake the exam 3 days after you started your first attempt. This is to ensure you have time to prepare in between exam attempts.
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Further exam attempts can be purchased at an additional cost. Visit tryhackme.com to view the price in your location. There is no limit on how many times you can retake SAL1.