I wouldn’t consider it a non-lucky day, well jokes behind now and let’s be serious. I passed the CCNP Switch 642-813 exam on Friday the 13-th eventhough since I made the schedule about 2 months before the exam date I even didn’t thought it was the 13-th, what I was looking for was only a Friday of July and as random selection I came down to the 13-th.
What I used for the exam preparation was:
1) CCNP SWITCH 642-813 Official Certification Guide.
2) INE Switch Bootcamp Training Video.
3) GNS3 for Labs.
4) and a lot of other blogs and cisco online documentation.