If you are starting to revise for your first MCA deck oral examination you may find the breadth of subject matter overwhelming. The following is a recommended reading list.
NP100 Mariners Handbook 10th Ed – 2015 (May be ordered from here)
DO NOT waste time reading primers and websites if they do not have an official stamp MCA, IMO etc.
Ensure that any guidance you seek is from a reputable source. Contact me if you have any concerns and want to get some guidance.