Quote from rarhoads:
You just have to pay an extra fee, like signing up again.
I've been asked this question before, as some people think there is a time limit to complete the exam.
Directly from the CFA Website -
Is there a time limit for candidates to complete all three levels of exam in the CFA Program?
No. CFA Institute does not require candidates to complete the CFA Program within a specified time frame. Nor does CFA Institute limit the number of times candidates may sit for each exam level or require candidates to repeat an exam level that they already have passed, regardless of the time elapsed between exams.
If it has been several years since I registered in the CFA Program. Will I have to pay the registration fee again?
No. Applicants pay an initial registration fee upon entering the CFA Program. Returning candidates pay only the enrollment fee for each exam taken.