in my opinion, dr nawaz's books r although somewhat outdated(as the author has expired) but easy to comprehend n to the point with simple illustrations n language. on the other hand, tanveer' s books r v. detailed n difficult 2 understand. if one goes through the past papers , one will find that the papers r of b.sc. level n dr. nawaz's books r enough 2 prep 4 them.regards.