Set Of 4 Most Demanding Books: 

1. Economic 101 ( From Consumer behavior to competitive markets- everything you need to know about economics)

2. Stock Market 101 ( from Bull and bear markets to dividends , shares, and margins - your essential guide to the stock market)

3. Mythology 101 ( From Gods and Goodness to monsters and Mortals, your guide to ancient mythology ) 

4. Genetics 101 ( From chromosomes and the double helix to cloning and DNA tests , everything you need to know about genes)