I happy to announce I passed SCEA part I yesterday with 85% of good answers.
I've been preparing the exam for around two month before actually taking it.
I based my preparation on Mark Cade SCEA and Humphrey Sheil study guide, which is vey concise book but very pertinent and useful.
I also got useful information from the JEE 5 tutorial and Mikalai Zaikin study guide.
I spent a lot of time reading different kinds of articles to better understand the technologies I was not knowing very well. Since I had a colleague preparing the exam as well we have been working together, challenging each other with questions, and this is also to me a motivating way to prepare for certification.
Now I start working on part II. There's not a lot of time remaining until the first of August.