Concepts... The calculations (such that there are) are easy. Things like conversions and molarity/molality, etc... Problems were similar to Barron's study guide. If you can do basic calculations you will be fine. Focus more on concepts.
I totally agree with DHG. I spent too much time working on calculations when studying for the test. Remember you won't have a calculator when you take the actual test, so there is a limit to what they can ask you to do calculation wise. Be sure you understand concepts and be able to do organic nomenclature.