Reading and understanding the USP 797 (primarily) and USP 800 material will go a very long way in preparing you for the exam.
Years ago, I took the sterile compounding class with N.P.T.A. (National Pharmacy Technician Association) and found its training to be very practical and useful.
https://stage.pharmacytechnician.org/npta/Sterile_CompoundingIV_Certification.asp225