K. Ali and Bhatti's books are good for short preparation time like now. But for detailed reading, references of Historians and especially for making notes go for MAJOR TARIQ AWAN'S HISTORY OF INDIA AND PAKISTAN in 2 volumes(costing more than a thousand rupee for 2 volumes). but for short time of preparation go for Bhatti because it has ready-made question answer format. Bhatti's MCQs are good too. All in all Bhatti series is must have.

Best of luck!

__________________
"A successful person is one who can lay a firm foundation with the bricks that others throw at him." (David Brinkley)