As for math you should know things like converting units (grams, mg), converting temperatures from Celsius to Farenheit (F=1.8C+32), converting inches to centimeters (2.5 cm per inch). You need to learn conversions between standard and military time. It would probably be in your best interest to understand ratio and proportion to help with the math. You will need to learn basic medical terms. Suffixes, root words, prefixes, abbreviations to common people (DDS-dentist, NP-nurse practitioner etc), places (ICU, CCU, PACU etc), blood tests (CBC-complete blood count, Hct-hematocrit etc), diagnostics (EKG, EEG, CTScan, MRI, BE etc), diseases and conditions (MI, CHF, URI, BPH, PID etc).
I have a program to help with the math if you'd like a copy. Offers a lot of questions for each subject to practice those different areas.