zubair i am not a senior but i will give you the advice i myself am following, i am in the same situation as you but i still prefer to follow Feldmans book because it gives you a better understanding and equips you better to handle a conceptual paper. As far as the time is concerned 11 chapters from Feldmans book will cover most of the syallabus for both papers (excluding Industrial and Criminal psychology), you can easily cover 11 chapters in 11 days and then go for exam cram...you are your own best judge