The posted practice problems.

Another list of practice questions that overlaps quite a bit with the above.

Two Boolean algebra problem sets I found at the bottom of some file drawer.

A few questions I compiled.

Here are some nice notes on CPU performance, and a set of CPU peformance problems, and another.

Some notes on graphs with some problems.

Some programming-oriented binary tree problems.

Some notes on regular expressions with questions.

A nice review of abstract complexity.