Read the blogpost I published in the Salesforce Developers blog.
It has been a while I don’t write a post and this is because I was studying for Dev I and II exams. The good news is that I passed both! In this post I am going to try to give some advice about each of the certifications.
In the same way I have elaborated an index of trailhead modules to work on if you want to get App Builder certification, I have created a similar index for Platform Developer I. Here you have the index: