Med calc tests can vary depending on difficulty and also the type of course you are taking. We had a med calc test for every nursing class with a clinical component in school, but they were also tailored to that specific patient population and what we were learning. In my early nursing classes (Fundamentals), the tests focused more on dosages calculations ("Order states give 650mg Tylenol Q6H fever/pain, you have 325mg tabs on hand, how much do you give?" or "Orders states give 2mg morphine Q4H PRN pain and you have 10mg/2mL syringes on hand, how much do you give?") and conversions (including drams and minims but I have yet to see this in practice now). When I got to my gero med-surg rotation, we started doing IV stuff, so our test included calculating mL/hr and drops/min.
Peds focused on pediatric dosage calculations, which are all weight-based, and fluid maintenance calculations which is big in that field of nursing.
Critical care focused on weight-based calculations, such as mcg/kg or mg/kg, and things like mcg/min, mcg/kg/min, mg/min, mg/hr and mcg/hr.