As you all know Salesforce Developer Certification (401) has been retired starting Feb 2017, and many are confused on the next process – especially when to take the transition exam and when to stop doing the maintenance exam.
I have already explained the dates and the transistion paths in my earlier post – Certification Expiration
Here’s another useful chart that explains the Expiration Timeline based on the Salesforce quarterly releases.
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sfdcFanBoy 
How many free retakes are allowed for maintenance exams of Admin and PD1?
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You are permitted unlimited attempts on the Salesforce release exams/modules required to maintain your credential(s). There is no cost to retake a release exam/module. So relax and attempt again. FYI, the latest maintenance exams of Admin are Here and PD1 Here
(Only exception is Pardot Consultant and Specialist Spring ’17 Release Exam – 3 attempts only)
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