Hey guys ! If u all are preparing for BITSAT, here's one advice i can give to u. You all should buy "BITSAT EXPLORER" by MTG. This book is worth buying, as it involves every topic of the syllabus which come in BITSAT. Moreover, the main feature of this book is that, u will get a free CD with it which includes  5 actual test to give you the feel of an online examination. And believe me it really gives u such feeling because I myself am preparing from it. For some highlights of this book go to http://www.pcmbtoday.com/op/bitsat.htm and have a look at it. All the best!!