IELTS C1 Advanced Certification

If you take a Cambridge exam now and you pass B2 or C1, 10, 20 years from now, you still have that. It doesn't expire. So yeah, so just the valid forever. But as I said, I think most employers would probably specify that they need a C1 advanced certification that has been given in the last five or 10 years. That's the best option because it's up to the employer then to decide for IELTS after two years.