You're thinking of the BC test - the AB test doesn't cover data structures - just basic OOP (Java flavor) and the general gist of Big-O notation.
It's a shame that they're discontinuing AB; it was actually pretty good when I took it.
I had some great memories in that class and definitely gave me the background I needed. Probably learned more in that class than in the early college Comp Sci classes.
Definitely a shame to lose it.