If you choose to participate in the ABOS WLA, the ABOS recommends that you begin in 2019. If you wait until 2021 to begin, you will have to get four straight years of answering all 30 questions correct.
You must answer 120 questions correctly by 2024 or achieve five Quality Years by 2024. A Quality Year is achieved by correctly answering 24 out of 30 questions.
You must submit your Recertification Application, Application Fee, Case List, and CME/SAE requirements by December 1, 2025 (can also apply by December 1, 2023 or December 1, 2024).