Ask HN: Computer Science GRE Subject Test

I'm a Biology student considering going on to grad school in Bioinformatics, which is in the Department of Computer Science so it's going to stress the computational side. I have a lot of programming experience but have only taken two "real" CS courses - Intro to and Advanced Bioinformatics Algorithms, which are Masters level courses here. If I can take and pass the CS GRE Subject Test at the 50th percentile or higher, I'll get preference for financial awards and get out of taking CS placement tests and makeup courses.

I'm wondering if this is realistic for a non CS student, and I don't have any real way to gauge that. For anyone who's taken the CS Subject Test, can I get your thoughts? How difficult was it for you, what types of questions seem to show up a lot, and in lieu of CS coursework what type of preparation would you recommend as most effective?

I have all the basic algorithms/data structures knowledge (or at least, I don't know what I don't know), as well as experience in different types of programming languages (from C++ to C#/VB.NET and Python and now Haskell.) I also have calculus, linear algebra, differential equations, and discrete math under my belt. My current research has involved fuzzy logic and issues of data access and database structure in ecology, and I've used algorithms such as dynamic programming and genetic algorithms for class projects.

Thanks for your help!