Many well researched books have been written on Ancient India but I think for a detailed and interesting read you should go for Upinder Singh’s A History of Ancient and Early Medieval India. read more
If you do not have enough time to refer to each book, you may refer Schweser notes. It has four books, one book for each section. It is also advisable to use “Options, Futures, and Other Derivatives” by John C. Hull. Please note it is also one of the books in the GARP recommended reading. read more