Heartiest congratulations on your success. CSS is indeed a very unpredictable exam, wherein luck plays the major part. As you yourself have mentioned that not at all times things show up the same. Once a subject is good for you, next time mortifying. I still remember how brilliant were your score in CE 2010 and yet still you fell short of 7 marks in essay. And where you stand now, proves that consistency, hard work and determination have finally paid off.

Regards