At what point during residency are the CORE Exam modules offered?

At what point during residency are the CORE Exam modules offered?

For residents who begin training in July, the first opportunity to take the CORE is late winter of the second year of dermatology residency.  At that administration, candidates may only take up to two modules.  The CORE Exam modules are offered three times during the third year of residency.  In those administrations, candidates may take any number of modules they wish.