Iowa Admin. Code r. 193A-4.7
Effective with the implementation of the computer-based examination, a candidate may take the required test subjects individually and in any order. Except as provided in rule 193A-3.7 (542), credit for any subjects passed will be valid for 18 months from the actual date the candidate sat for the subject, without the candidate having to attain a minimum score on any failed subject(s) and without regard to whether the candidate sat for any other subjects. The candidate needs to pass both subjects of the examination within a rolling 18-month period that begins on the date that the first subject is passed. If both subjects are not passed within the 18-month period, credit for any subject taken outside the 18-month period will expire.
Iowa Admin. Code r. 193A-4.7