Hello @mossimo7894!
Only one exam would be sufficient, as you only need to renew it.
Please refer to the re-certification rules.
Huawei certification consists of three technical domains: the ICT Infrastructure certification, Platform and Service certification and ICT Vertical certification.
Examinees can update the validity date of the certificate in any of the following cases before the certificate expires:
More information here:
https://support.huawei.com/learning/Certificate!toRecertification?lang=en
Best regards!