There is no such thing as a poor memory, only a trained or untrained one. There is no limit to the capacity of the memory. Lucius Scipio was able to remember the names of all the people of Rome; Seneca could memorize and repeat two thousand words after hearing them once.
Often we use less then a nanometer(1/1000000000 of a meter) of our brain for the daily stuff...most parts of the brain...are unused and become lazy..& when they become lazy..they can't hold much info..as all the impulses (electrial & chemical) decay pretty fast..in the nerer cells.
Comming to this book..this book is written by the person who has the most phenominal memory in the world..this book TRAINS YOUR MEMORY..So that you will Remember and Never forget...what you wanna Remember...easily.