Since last year, we received the announcement that some of the SharePoint 2013 certifications were being retired in September of last year. But after that, they extended the deadline to 2017. This new deadline can be explained due there is no new certifications focused on development for SharePoint 2016 have been released yet.
Exam on Microsoft’s website: https://www.microsoft.com/pt-br/learning/exam-70-488.aspx
Therefore, here is a set of links that you can use as a study guide to pass on that exam before it is retired.
This summary was once made by Martin Bodocky and kept on this blog post “70-488 – Developing Microsoft Sharepoint Server 2013 Core Solutions – Preparation links“. Unfortunatelly, it’s not online anymore, so I decided to provide this information once again at the same time that I must say: Bodocky made everything and helped me on passing this exam, back on 2014.