Johnson , Architect exam will definitely be the exam
testing the depth. Please visit Sun Educational services & read the obectives of the exam clearly. It will clear a lot of your doubts. It will also give you fair amount of Idea , whether Depth is required or not. Plus , do see the sample questions on the site. That will remove slightest of the doubt in your mind.
GO through those things first & Start preapring
with depth. It will be great help for future.
Your Friendly Bartender
Shailesh