Currently, I am read Morgan and Mikhail but i find myself wondering if this book is truly the best as I tend to forget most of what i read.
Then you need to change your methods. Morgan and Mikhail isn't really any better or worse than any other textbook out there. They all say the same things. Your problem isn't M&M, it's reading a textbook and retaining the information. You probably had the same problem with your med school biochem text, and your undergrad zoology text.
Sitting down and reading a textbook, one chapter after another, is mostly wasted time for most people. To an extent, as a new CA-1 there's no avoiding that approach for
some of your study time ... there is a bunch of basic stuff you simply have to memorize.
Better ways for most people to learn:
1) Make it an active process. Study for multiple, short periods of time. Read something for less than 10 minutes, then do practice questions on the same subject. Or listen to a podcast, write notes from your short term memory, listen again. Watch a (short) video, that sort of thing.
2) Relate it to a patient. You know what cases you're doing tomorrow ... read about the patient's disease processes and impact on anesthesia in detail. That information is immediate, interesting, and easy to retain for a long time, if not forever.